EXCLUSIVE: Jon Gosselin says he doesn't know where his 12-year-old son Collin is, claims Kate won't tell him

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In an exclusive sit-down with ET, Jon Gosselin says he's completely out of the loop when it comes to his 12-year-old son Collin's current whereabouts.

"I have an idea where he is but I don't really know where he is," Jon tells ET's Jennifer Peros. The former Jon & Kate Plus 8 star goes on to say that while his ex-wife, Kate Gosselin, "says that Collin is in a special school for special needs kids with behavioral problems," Jon claims he has been told otherwise by law enforcement officials.

In August, Kate revealed that she enrolled Collin -- one of the divorced couple's eight children together -- in a program away from home to help him cope with "special needs." Collin is missing from the new Kate Plus Eight trailer that debuted late last month, and won't be appearing in the new season of the TLC reality show.

See photos of the Jon Gosselin through the years:

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Jon Gosselin through the years
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Jon Gosselin through the years
ATLANTIC CITY, NJ - MAY 30: DJ Jon Gosselin performs at The Pool After Dark at Harrah's Resort on Saturday May 30, 2015 in Atlantic City, New Jersey. (Photo by Tom Briglia/FilmMagic)
ATLANTIC CITY, NJ - MAY 30: DJ Jon Gosselin along with DJ Noah perform at The Pool After Dark at Harrah's Resort on Saturday May 30, 2015 in Atlantic City, New Jersey. (Photo by Tom Briglia/FilmMagic)
NEW YORK, NY - JANUARY 31: Jon Gosselin attends Talent Resources Sports presents Maxim 'Big Game Weekend' sponsored by AQUAhydrate, Heavenly Resorts, Wonderful Pistachios, Patron Tequila, Touch by Alyssa Milano and Philippe Chow at ESPACE on January 31, 2014 in New York City. (Photo by Anna Webber/Getty Images for Maxim)
ATLANTIC CITY, NJ - MAY 30: DJ Jon Gosselin along with DJ Noah perform at The Pool After Dark at Harrah's Resort on Saturday May 30, 2015 in Atlantic City, New Jersey. (Photo by Tom Briglia/FilmMagic)
TEANECK, NJ - JUNE 27: Jon Gosselin attends a press conference on Tax Deductible Marriage Counseling at Bergen Marriage Counseling & Psychotherapy on June 27, 2012 in Teaneck, New Jersey. (Photo by Dave Kotinsky/Getty Images)
TEANECK, NJ - JUNE 27: Jon Gosselin attends a press conference on Tax Deductible Marriage Counseling at Bergen Marriage Counseling & Psychotherapy on June 27, 2012 in Teaneck, New Jersey. (Photo by Dave Kotinsky/Getty Images)
NEW YORK, NY - APRIL 24: Television personality Jon Gosselin attends Toasting the 2012 NFL Draft Class kick-off at the Bounce Sporting Club on April 24, 2012 in New York City. (Photo by Bobby Bank/WireImage)
NEW YORK, NY - APRIL 24: Television personality Jon Gosselin attends Toasting the 2012 NFL Draft Class kick-off at the Bounce Sporting Club on April 24, 2012 in New York City. (Photo by Bobby Bank/WireImage)
PHILADELPHIA, PA - APRIL 04: Jon Gosselin attends the Launch Party for Virgin America's First Flight from Los Angeles to Philadelphia at the Hotel Palomar on April 4, 2012 in Philadelphia, Pennsylvania. (Photo by Michael Buckner/Getty Images)
LOS ANGELES, CA - MARCH 29: Jon Gosselin attends the 2nd annual 'Night of a Billion Reality Stars' bash at SupperClub Los Angeles on March 29, 2012 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - JUNE 16: Jon Gosselin arrives at THQ's E3 'Take No Prisoners' event at The Standard Hotel Downtown on June 16, 2010 in Los Angeles, California. (Photo by Angela Weiss/Getty Images)
PARK CITY, UT - JANUARY 22: Jon Gosselin attends The Sky Suite at Sky Lodge on January 22, 2010 in Park City, Utah. (Photo by Jerritt Clark/WireImage)
NEW YORK - NOVEMBER 09: Television personality Jon Gosselin tapes 'The Insider' in Father Duffy Square on November 09, 2009 in New York City. (Photo by Ray Tamarra/Getty Images)
NEW YORK - NOVEMBER 01: Television personality Jon Gosselin meets with Rabbi Shmuley Boteach at the West Side Jewish Center on November 01, 2009 in New York City. (Photo by Ray Tamarra/Getty Images)
NORRISTOWN, PA. - OCTOBER 26: Television reality star Jon Gosselin (C) speaks with the media as he leaves Montgomery County Courthouse after a hearing regarding his divorce from wife Kate Gosselin, October 26, 2009 in Norristown, Pennsylvania. Kate did not attend the hearing. (Photo by William Thomas Cain/Getty Images)
NORRISTOWN, PA. - OCTOBER 26: Television reality star Jon Gosselin speaks with the media as he leaves Montgomery County Courthouse after a hearing regarding his divorce from wife Kate Gosselin, October 26, 2009 in Norristown, Pennsylvania. Kate did not attend the hearing. (Photo by William Thomas Cain/Getty Images)
NEW YORK - OCTOBER 08: Television personality Jon Gosselin leaves his Manhattan apartment to pick up his daughters on October 08, 2009 in New York City. (Photo by Ray Tamarra/Getty Images)
Jon Gosselin arrives at Los Angeles International Airport on October 6, 2009 in Los Angeles, California. (Photo by Leandro DiCapua/BuzzFoto/FilmMagic)
Jon Gosselin launches his milkshakes at Millions Of Milkshakes on October 3, 2009 in West Hollywood, California. (Photo by Jean Baptiste Lacroix/WireImage)
LOS ANGELES, CA - OCTOBER 03: TV personality Jon Gosselin launches his milkshake at Millions Of Milkshakes on October 3, 2009 in Los Angeles, California. (Photo by Angela Weiss/Getty Images)
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WATCH: EXCLUSIVE -- Jon Gosselin Talks Estrangement From His Kids -- 'I Haven't Seen All 8 of My Kids Together in 3 Years'

Kate currently has full legal custody of their kids -- twins Cara and Mady, now 16; sextuplets Aaden, Collin, Joel, Leah, Alexis and Hannah, now 12 -- while Jon has partial physical custody.

Jon, 39, says he hasn't seen Collin in over a year and a half, when he claims 41-year-old Kate took him out of the private school he was attending without consulting him. Jon says he's now going to court to attempt to get a judge to force his ex-wife to tell him where his son is.

"I mean, I ask but she doesn't tell me," he says about Collin's current whereabouts. "She doesn't answer any of my texts."

Jon claims that Collin's brothers and sisters are also not in touch with him, and also have "no idea" where Collin is. "They know that their mom told them that he has behavioral issues," he says.

See photos of Kate Gosselin through the years:

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Kate Gosselin through the years
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Kate Gosselin through the years
CELEBRITY APPRENTICE -- Finale Red Carpet and Party -- Pictured: Kate Gosselin on Monday, February 16, 2015 -- (Photo by: Mike Pont/NBC/NBCU Photo Bank via Getty Images)
NEW YORK NY - APRIL 05: Kate Gosselin sighting on April 5, 2014 in New York City. (Photo by Josiah Kamau/BuzzFoto/FilmMagic)
TODAY -- Pictured: (l-r) Kate Gosselin and John Gosselin talk about their twin daughters and sextuplets on NBC News' 'Today' on October 2, 2007 -- Photo by: Heidi Gutman/NBC NewsWire
NEW YORK, NY - APRIL 23: Television personalities John and Kate Gosselin attend the Discovery Upfront Presentation NY - Talent Images at the Frederick P. Rose Hall on April 23, 2008 in New York City.(Photo by Thos Robinson/Getty Images for Discovery)
NEW YORK, NY - APRIL 23: Television personalities John and Kate Gosselin and President & CEO of Discovery Communications David Zaslav attend the Discovery Upfront Presentation NY - Talent Images at the Frederick P. Rose Hall on April 23, 2008 in New York City.(Photo by Thos Robinson/Getty Images for Discovery)
NEW YORK - MARCH 04: 'Dancing with the Stars' Tony Dovolani and Kate Gosselin attend the premiere of 'Life' at Alice Tully Hall, Lincoln Center on March 4, 2010 in New York City. (Photo by Charles Eshelman/FilmMagic)
NEW YORK - MARCH 17: Kate Gosselin and her bodyguard Steve Neild leave after having lunch at Sarabeth's Central Park South on March 17, 2010 in New York City. (Photo by James Devaney/WireImage)
LAS VEGAS, NV - MARCH 29: MGM Grand President and Chief Operating Officer Scott Sibella (L) and television personality Kate Gosselin attend the grand opening of Brad Garrett's Comedy Club at the MGM Grand Hotel/Casino on March 29, 2012 in Las Vegas, Nevada. (Photo by David Becker/WireImage)
PASADENA, CA - JANUARY 16: TV personality Kate Gosselin of 'The Celebrity Apprentice' poses for a portrait during the NBCUniversal TCA Press Tour at The Langham Huntington, Pasadena on January 16, 2015 in Pasadena, California. (Photo by: Christopher Polk/NBC/NBCU Photo Bank via Getty Images) NUP_166973_2046.JPG
NEW YORK, NY - JUNE 19: Television personality Kate Gosselin enters the 'Good Morning America' taping at the ABC Times Square Studios on June 19, 2014 in New York City. (Photo by Ray Tamarra/GC Images)
GOOD MORNING AMERICA - Kate Gosselin is a guest on 'Good Morning America,' 6/19/14, airing on the ABC Television Network. (Photo by Fred Lee/ABC via Getty Images)
NEW YORK, NY - APRIL 01: Kate Gosselin and Leeza Gibbons on the set of 'Celebrity Apprentice' on April 1, 2014 in New York City. (Photo by Bobby Bank/GC Images)
NEW YORK, NY - APRIL 05: Kate Gosselin seen filming 'Celebrity Apprentice' on April 5, 2014 in New York City. (Photo by Alessio Botticelli/GC Images)
CELEBRITY APPRENTICE -- Episode 1401 -- Pictured: (l-r) Keshia Knight Pulliam, Leeza Gibbons, Kate Gosselin, Kenya Moore, Vivica A Fox, Brandi Glanville, Shawn Johnson, Jamie Anderson -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MARCH 25: Kate Gosselin on the set of 'Celebrity Apprentice' on March 25, 2014 in New York City. (Photo by Bobby Bank/WireImage)
CELEBRITY APPRENTICE -- Episode 1401 -- Pictured: (l-r) Jamie Anderson, Kate Gosselin, Kenya Moore -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
CELEBRITY APPRENTICE -- Episode 1401 -- Pictured: (l-r) Kate Gosselin, Jamie Anderson, Keshia Knight Pulliam, Leeza Gibbons, Kenya Moore, Viviva A. Fox, Shawn Johsnon, Brandi Glanville -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
TODAY -- Pictured: (l-r) Cara Gosselin, Kate Gosselin, Mady Gosselin and Savannah Guthrie appear on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
TODAY -- Pictured: (l-r) Cara Gosselin, Kate Gosselin and Mady Gosselin appear on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
TORONTO, ON - OCTOBER 1: Kate Gosselin, former reality star and long time target of the tabloids, now author of new cookbook called Love Is In The Mix in Toronto to promote the book. Toronto, October 1, 2013. (Colin McConnell/Toronto Star via Getty Images)
TORONTO, ON - OCTOBER 01: Reality TV Star Kate Gosselin Appears On CTV's 'The Marilyn Denis Show' at Bell Media Headquarters on October 1, 2013 in Toronto, Canada. (Photo by George Pimentel/WireImage)
NEW YORK, NY - SEPTEMBER 26: Bethenny hosts Kate Gosselin, Loni Love, Michael Yo, Jenny Mollen, and Maksim Chmerkovskiy at the CBS Broadcast Center on September 26, 2013 in New York City. (Photo by Neilson Barnard/Getty Images for 'bethenny')
NEW YORK, NY - SEPTEMBER 25: Kate Gosselin visits SiriusXM Studios on September 25, 2013 in New York City. (Photo by Robin Marchant/Getty Images)
NEW YORK, NY - SEPTEMBER 25: AJ Calloway (L) interviews TV personality Kate Gosselin during her visit to 'Extra' in Times Square on September 25, 2013 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
LAS VEGAS - DECEMBER 2: Television personality Kate Gosselin (L) and a performer from 'KA by Cirque du Soleil' arrive at the Zappos.com Rock 'n' Roll Las Vegas Marathon on December 2, 2012 in Las Vegas, Nevada. (Photo by Isaac Brekken/Getty Images for Rock 'n' Roll Marathon)
LAS VEGAS, NV - DECEMBER 02: Television personality Kate Gosselin arrives at the Zappos.com Rock 'n' Roll Las Vegas Marathon and Half-Marathon on December 2, 2012 in Las Vegas, Nevada. (Photo by Jeff R. Bottari/Getty Images)
NEW YORK, NY - SEPTEMBER 12: TV personality Kate Gosselin attends the 'Real Fashion, Real Women' Runway Show Benefiting Bottomless Closetat Empire Hotel on September 12, 2012 in New York City. (Photo by Taylor Hill/Getty Images)
NEW YORK, NY - SEPTEMBER 12: TV personality Kate Gosselin attends the 'Real Fashion, Real Women' Runway Show Benefiting Bottomless Closetat Empire Hotel on September 12, 2012 in New York City. (Photo by Taylor Hill/Getty Images)
NEW YORK, NY - SEPTEMBER 12: TV personality Kate Gosselin walks the runway during the Derek Warburton 'Real Fashion, Real Women' Benefit during Spring 2013 Mercedes-Benz Fashion Week at Empire Hotel on September 12, 2012 in New York City. (Photo by Randy Brooke/WireImage)
NEW YORK, NY - AUGUST 03: Kate Gosselin attends BlogHer '12 at the Hilton New York on August 3, 2012 in New York City. (Photo by Laura Cavanaugh/Getty Images)
CHICAGO, IL - JULY 22: Kate Gosselin takes part in the 2012 Rock 'n' Roll Chicago Half Marathon at Grant Park on July 22, 2012 in Chicago, Illinois. (Photo by Timothy Hiatt/Getty Images)
TODAY -- Pictured: Kate Gosselin appears on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
TODAY -- Pictured: Kate Gosselin appears on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
TODAY -- Pictured: Kate Gosselin appears on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
LOUISVILLE, KY - MAY 07: Kate Gosselin attends the 137th Kentucky Derby at Churchill Downs on May 7, 2011 in Louisville, Kentucky. (Photo by Michael Hickey/WireImage)
LOUISVILLE, KY - MAY 06: Kate Gosselin attends the Style Icon 2011 Luxury Gifting Suite at the Galt House - Day 1 at the Galt House Hotel & Suites Grand Ballroom on May 6, 2011 in Louisville, Kentucky. (Photo by Jeff Gentner/Getty Images for Style Icon)
NEW YORK CITY - MARCH 18: Kate Gosselin sighting at STK restaurant on March 18, 2011 in New York City. (Photo by Christopher Peterson/BuzzFoto/FilmMagic)
TV personality Kate Gosselin arrives at the 62nd Primetime Emmy Awards at Nokia Plaza L.A. LIVE on August 29, 2010 in Los Angeles, California.
TODAY -- Pictured: Kate Gosselin appears on NBC News' 'Today' show (Photo by Peter Kramer/NBC/NBCU Photo Bank via Getty Images)
Kate Gosselin sighting at ABC Studios on April 23, 2010 in New York City.
DANCING WITH THE STARS THE RESULTS SHOW - 'Episode 1010A' - In the two-hour finale on TUESDAY, MAY 25 (9:00-11:00 p.m., ET), all previously eliminated couples returned to perform all-new dance routines. (Photo by Adam Larkey/ABC via Getty Images) KATE GOSSELIN, TONY DOVOLANI
DANCING WITH THE STARS - 'Episode 1005' - This week on 'Dancing with the Stars,' it was movie night, with eight remaining couple doing the Jive, Quickstep, Cha Cha Cha, Tango, Foxtrot and Rumba to iconic songs from famous films such as 'Pulp Fiction,' 'Breakfast Club' and 'Risky Business,' among others, airing MONDAY, APRIL 19 (8:00-9:32 p.m.,ET), on the ABC Television Network. (Photo by Adam Larkey/ABC via Getty Images) TONY DOVOLANI, KATE GOSSELIN
DANCING WITH THE STARS - In week five of 'Dancing with the Stars,' the remaining couples return to the stage, MONDAY, APRIL 19 (8:00-9:32 p.m., ET), on the ABC Television Network. (Photo by Greg Zabilski/ABC via Getty Images) TONY DOVOLANI, KATE GOSSELIN
TV personality Kate Gosselin poses at Kate Gosselin Signs Copies Of 'I Just Want You to Know: Letters To My Kids' at Barnes & Noble 3rd Street Promenade on April 16, 2010 in Santa Monica, California. (Photo by Jon Kopaloff/FilmMagic)
THE TONIGHT SHOW WITH JAY LENO -- Episode 3808 -- Pictured: Television personality Kate Gosselin during an interview on April 15, 2010 -- Photo by: Paul Drinkwater/NBCU Photo Bank
DANCING WITH THE STARS - In week three of 'Dancing with the Stars,' the remaining couples return to the stage, MONDAY, APRIL 5 (8:00-10:02 p.m., ET), on the ABC Television Network. (Photo by Kelsey McNeal/ABC via Getty Images) KATE GOSSELIN, TONY DOVOLANI, BROOKE BURKE
NEW YORK - MARCH 04: TV personality Kate Gosselin attends the after party for the premiere of Discovery Channel's 'Life' at Alice Tully Hall, Lincoln Center on March 4, 2010 in New York City. (Photo by Stephen Lovekin/Getty Images)
LONG BEACH, CA - OCTOBER 26: Kate Gosselin signs copies of her book Eight Little Faces at the 2009 Women's Conference - Day 1 at Long Beach Convention Center on October 26, 2009 in Long Beach, California. (Photo by Dr. Billy Ingram/Getty Images)
TODAY -- Aired 10/05/2009 -- Pictured: Kate Gosselin -- In an exclusive interview with NBC News' Meredith Vieira, Kate Gosselin speaks out about the suspension of her reality show, her messy split with her husband, Jon, and reports that he took thousands of dollars out of their joint bank account (Photo by Virginia Sherwood/NBC/NBCU Photo Bank via Getty Images)
DANBURY, CT - SEPTEMBER 26: Kate Gosselin of 'John and Kate Plus 8' reality TV on TLC introduces ice skaters during the 8th annual Stars, Stripes & Skates to benifit the Heritage Foundation of 9/11, September 26, 2009 in Danbury, Connecticut. (Photo by Douglas Healey/Getty Images)
BEVERLY HILLS, CA - AUGUST 25: Kate Gosselin sighting at CNN news building on August 25, 2009 in Beverly Hills, California. (Photo by David Aguilera/BuzzFoto/FilmMagic) *** Local Caption ***
TODAY -- Airdate 08/10/2009 -- Meredith Vieira interviews Kate Gosselin of 'Jon and Kate plus 8' -- Pictured: Kate Gosselin (Photo by Lisa Berg/NBC/NBCU Photo Bank via Getty Images)
NEW YORK - AUGUST 10: Kate Gosselin visits FAO Schwarz on August 10, 2009 in New York City. (Photo by James Devaney/WireImage) *** Local Caption ***
GLENDALE, CA - APRIL 14: Kate Gosselin signs copies of her new book 'Eight Little Faces' and her New York Times Bestselling book, 'Multiple Blessings' at the Barnes & Noble in Americana at Brand on April 14, 2009 in Glendale, California. (Photo by Michael Kovac/FilmMagic)
GLENDALE, CA - APRIL 14: Kate Gosselin signs copies of her new book 'Eight Little Faces' and her New York Times Bestselling book, 'Multiple Blessings' at the Barnes & Noble in Americana at Brand on April 14, 2009 in Glendale, California. (Photo by Michael Kovac/FilmMagic)
NEW YORK - APRIL 2: (L-R) Television personalities Jon Gosselin and Kate Gosselin of TLC's 'Jon & Kate Plus 8' and Buddy Valastro of TLC's 'Cake Boss' attend Discovery Upfront at Jazz at Lincoln Center April 2, 2009 in New York City. (Photo by Amy Sussman/WireImage for Discovery Communications)
NEW YORK - APRIL 02: Kate Gosselin and Jon Gosselin attend Discovery Upfront at Jazz at Lincoln Center on April 2, 2009 in New York City. (Photo by Brad Barket/WireImage for Discovery Communications)
TODAY -- Pictured: (l-r) Kate Gosselin and John Gosselin speak with News Anchor Ann Curry about their twin daughters and sextuplets on NBC News' 'Today' on October 2, 2007 -- Photo by: Heidi Gutman/NBC NewsWire
TODAY -- Pictured: (l-r) Kate Gosselin and John Gosselin talk about their twin daughters and sextuplets on NBC News' 'Today' on October 2, 2007 -- Photo by: Heidi Gutman/NBC NewsWire
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As for whether Jon saw any behavioral problems with Collin himself, Jon says his son "seemed fine" to him the last time he saw him. He describes Collin as "really smart" and being "incredibly intuitive."

"I could see my kids getting annoyed with that because he's the smartest and he does this, and he does that, and he always wants it his way," he says. "He's very particular, which could be bothersome. But, he's very loving too. He was a cuddly kid as a baby."

ET has reached out to Kate for comment. Tune in to ET on Wednesday to see Jon go into detail about what he believes his kids' current lives are like with Kate.

WATCH: Jon Gosselin Celebrates Twins Mady and Cara's 16th Birthday With Sweet Instagram Pic -- A Few Days Late

In August, Jon told ET that he was very "upset" at Kate's headline-making tell-all to People, in which she discussed Collin's health. "Collin has special needs," Kate said. "[There's] a fairly fluid diagnosis of what those needs are, but he needs to learn certain strategies to help him deal with things. This has been a struggle we've had for a very long time, and it's one I've dealt with on my own."

"I love my children very much," Jon fired back. "I've always been there for them and I always will be. It's shocking."


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