Katherine Jackson surrenders guardianship of Michael Jackson's youngest son, Blanket, to TJ Jackson

Katherine Jackson, matriarch of the Jackson family, has surrendered her co-guardianship over Blanket, her late son Michael Jackson's youngest child, who is now 15.

According to court documents obtained by ET, Katherine has filed papers to hand over sole guardianship of Blanket (real name: Michael Joseph Jackson, Jr.) to Tito Joe "TJ" Jackson, Blanket's 39-year-old cousin.

"Katherine is no longer needed to fulfill the duties that were necessary when joint-guardians were appointed," the documents state. "Given her own age [87] and the fact that [Blanket] is now 15 years old, Katherine feels that TJ is able to assume all necessary responsibilities of the guardianship for the Minor Child."

Along with TJ, Katherine was appointed joint legal guardian of all three of Michael's children -- Blanket, Paris and Prince -- on Sept. 14, 2012, following the King of Pop's tragic death.

21 PHOTOS
Paris Jackson and Prince Jackson together
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Paris Jackson and Prince Jackson together
BEVERLY HILLS, CA - OCTOBER 24: Michael Joseph Jackson, Jr. aka Prince Jackson (L) and Paris Jackson attend the mothers2mothers and ETAF event held on October 24, 2017 in Beverly Hills, California. (Photo by Michael Tran/FilmMagic)
BEVERLY HILLS, CA - OCTOBER 24: (L-R) Prince Jackson and Paris Jackson attend the mothers2mothers and The Elizabeth Taylor AIDS Foundation Benefit Dinner on October 24, 2017 in Beverly Hills, California. (Photo by Tibrina Hobson/Getty Images)
BEVERLY HILLS, CA - OCTOBER 24: (L-R) Prince Jackson and Paris Jackson attend the mothers2mothers and The Elizabeth Taylor AIDS Foundation Benefit Dinner on October 24, 2017 in Beverly Hills, California. (Photo by Tibrina Hobson/Getty Images)
BEVERLY HILLS, CA - OCTOBER 24: Prince Jackson attends the mothers2mothers and The Elizabeth Taylor AIDS Foundation Benefit Dinner on October 24, 2017 in Beverly Hills, California. (Photo by Tibrina Hobson/Getty Images)
BEVERLY HILLS, CA - OCTOBER 24: Paris Jackson attends the mothers2mothers and The Elizabeth Taylor AIDS Foundation Benefit Dinner on October 24, 2017 in Beverly Hills, California. (Photo by Tibrina Hobson/Getty Images)
BEVERLY HILLS, CA - OCTOBER 24: Paris Jackson attends the mothers2mothers and The Elizabeth Taylor AIDS Foundation Benefit Dinner on October 24, 2017 in Beverly Hills, California. (Photo by Tibrina Hobson/Getty Images)
BEVERLY HILLS, CA - OCTOBER 11: Paris Jackson and Prince Michael Jackson attend the Mr. Pink Ginseng Drink launch party at Regent Beverly Wilshire Hotel on October 11, 2012 in Beverly Hills, California. (Photo by Jason LaVeris/FilmMagic)
BEVERLY HILLS, CA - OCTOBER 11: Paris Jackson and Prince Michael Jackson attend the Mr. Pink Ginseng Drink launch party at Regent Beverly Wilshire Hotel on October 11, 2012 in Beverly Hills, California. (Photo by Jason LaVeris/FilmMagic)
GARY, IN - AUGUST 30: Prince Jackson, La Toya Jackson, Prince Michael Jackson II and Paris Jackson attend the St. Paul Saints Vs. The Gary SouthShore RailCats baseball game at U.S. Steel Yard on August 30, 2012 in Gary, Indiana. (Photo by Tasos Katopodis/Getty Images)
GARY, IN - AUGUST 29: Prince Michael Jackson I and Paris Jackson attend the press conference for Goin' Back To Indiana: Can You Feel It at the Majestic Star Hotel Lakeshore Ballroom on August 29, 2012 in Gary, Indiana. (Photo by Tasos Katopodis/Getty Images)
GARY, IN - AUGUST 30: Prince Michael Jackson II, Paris Jackson and Prince Jackson attend the St. Paul Saints Vs. The Gary SouthShore RailCats baseball game at U.S. Steel Yard on August 30, 2012 in Gary, Indiana. (Photo by Tasos Katopodis/Getty Images)
GARY, IN - AUGUST 29: Prince Michael Jackson I and Paris Jackson attend the press conference for Goin' Back To Indiana: Can You Feel It at the Majestic Star Hotel Lakeshore Ballroom on August 29, 2012 in Gary, Indiana. (Photo by Tasos Katopodis/Getty Images)
LOS ANGELES, CA - JANUARY 27: (L-R) Blanket Jackson, Paris Jackson and Prince Michael Jackson attend the Los Angeles opening of 'Michael Jackson THE IMMORTAL World Tour' at Staples Center on January 27, 2012 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
(L-R) Prince Michael 'Blanket' Jackson, Paris Jackson and Prince Jackson arrive at the Michael Jackson The Immortal World Tour in Los Angeles, California, on January 27, 2012. AFP PHOTO/VALERIE MACON / AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
(L-R) Prince Michael Jackson, Paris Jackson and Prince Michael II Jackson attend the Estate of Michael jackson's hand and foot print ceremony at Hollywood's legendary Grauman's Chinese Theater. (Photo by Frank Trapper/Corbis via Getty Images)
HOLLYWOOD, CA - JANUARY 26: Michael Jackson's children (L-R) Prince Jackson and Paris Jackson during the Michael Jackson Hand And Footprint Ceremony at Grauman's Chinese Theatre on January 26, 2012 in Hollywood, California. (Photo by Mark Sullivan/WireImage)
Blanket Jackson, Prince Jackson and Paris Jackson onstage at 'Michael Forever The Tribute Concert' at Millennium Stadium. (Photo by Rune Hellestad/Corbis via Getty Images)
LOS ANGELES, CA - AUGUST 11: Prince Michael Jackson, Paris Jackson and Blanket Jackson attend the Jackson Family donation event at Children's Hospital Los Angeles on August 8, 2011 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
Prince Jackson and Paris Jackson attend the Jackson Family Art Donation Event at Children's Hospital Los Angeles on August 8, 2011 in Los Angeles, California.
From left, Michael Jackson's sister Janet Jackson, daughter Paris, sister LaToya Jackson, brother Jermaine Jackson and oldest son Prince Michael I attend a memorial service for the 'King of Pop' at the Staples Center in Los Angeleson July 7, 2009. AFP PHOTO/GABRIEL BOUYS/POOL (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
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Last week, Prince, 20, and Paris, 19, made a rare public appearance together at the Elizabeth Taylor AIDS Foundation and mothers2mothers dinner at Ron Burkle's Green Acres Estate in Beverly Hills, California.

Paris wore a floral off-the-shoulder Zac Posen maxi dress, while Prince opted for a sophisticated black blazer paired with jeans. Paris later took to Instagram to thank Prince for his constant support over the years.

"You accept my crazy a** for who I am, and love me unconditionally despite how out there I can be sometimes," she wrote. "You support anything and everything I do solely because you know I'm passionate about it. You're my ride or die. Thank you for everything, you're such a f**king blessing in my life and I don't know where I'd be if I didn't have you."

27 PHOTOS
Michael Jackson through the years
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Michael Jackson through the years
CIRCA 1969: R&B quintet 'Jackson 5' pose for a portrait in circa 1969. Clockwise from bottom left: Michael Jackson, Tito Jackson, Jackie Jackson, Jermaine Jackson, Marlon Jackson. (Photo by Michael Ochs Archives/Getty Images)
American singer Michael Jackson poses at a hotel while on tour with Jackson 5, London, England, November 1972. (Photo by Express Newspapers/Getty Images)
American pop singer Michael Jackson attends the opening of the stage musical 'Dream Girls,' In Los Angeles, 1983. (Photo by Frank Edwards/Fotos International/Getty Images)
Undated picture of US pop singer Michael Jackson. Michael Jackson died on June 25, 2009 after suffering a cardiac arrest, sending shockwaves sweeping across the world and tributes pouring in on June 26 for the tortured music icon revered as the 'King of Pop.' AFP PHOTO (Photo credit should read /AFP/GettyImages)
(FILES) US pop star and entertainer Michael Jackson (R) and actress Brooke Shields arrive at the shrine Auditorium in Los Angeles where Jackson is expected to run away with a major part of the Grammy awards on Febuary 28, 1984. Michael Jackson died on June 25, 2009 after suffering a cardiac arrest, sending shockwaves sweeping across the world and tributes pouring in on June 26 for the tortured music icon revered as the 'King of Pop.' AFP PHOTO/Alan ZANGER (Photo credit should read BERTRAND GUAY/AFP/Getty Images)
American singer Michael Jackson (1958 - 2009) performing on stage, circa 1987. (Photo by Dave Hogan/Getty Images)
American singer Michael Jackson performing, 1987. (Photo by Dave Hogan/Hulton Archive/Getty Images)
LANDOVER, UNITED STATES: American pop music star Michael Jackson sings 13 October 1988 at the Capital Center in Landover, Maryland. AFP PHOTO/Luke FRAZZA (Photo credit should read LUKE FRAZZA/AFP/Getty Images)
(FILES) US pop star and entertainer Michael Jackson performs during the opening concert of the Asian leg of his 'Dangerous' world tour in National Stadium in Bangkok on August 24, 1993. Michael Jackson died on June 25, 2009 after suffering a cardiac arrest, sending shockwaves sweeping across the world and tributes pouring in on June 26 for the tortured music icon revered as the 'King of Pop.' AFP PHOTO/Pongsak CHAIYANUWONG (Photo credit should read PONGSAK CHAIYANUWONG/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 7: Singer Michael Jackson (R) and guitarist Slash of 'Guns and Roses' perform the opening number at the 1995 MTV Video Music Awards 07 September held at the Radio City Music Hall in New York. Jackson and sister Janet Jackson have been nominted for 11 awards for their video 'Scream.' AFP PHOTO (Photo credit should read DON EMMERT/AFP/Getty Images)
US pop star and entertainer Michael Jackson performs during a concert at Vincennes hypodrome on September 13, 1992. Michael Jackson died on June 25, 2009 after suffering a cardiac arrest, sending shockwaves sweeping across the world and tributes pouring in on June 26 for the tortured music icon revered as the 'King of Pop.' AFP PHOTO/Bertrand GUAY (Photo credit should read BERTRAND GUAY/AFP/Getty Images)
(FILES) US pop star Michael Jackson waves to photographers during a press conference in Paris on March 19, 1996. Michael Jackson died on June 25, 2009 after suffering a cardiac arrest, sending shockwaves sweeping across the world and tributes pouring in for the tortured music icon revered as the 'King of Pop.' AFP PHOTO / VINCENT AMALVY (Photo credit should read VINCENT AMALVY/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 7: Michael Jackson (C) performs at Madison Square Garden in New York 07 September, 2001. It was the first of two performances in New York as part of his '30th Anniversary Celebration, the Solo Years.' AFP PHOTO (Photo credit should read BETH A. KEISER/AFP/Getty Images)
NEW YORK, UNITED STATES: (FILES) This 06 July, 2002, file photo shows pop singer Michael Jackson (L) waving from his limo to fans in the Harlem neighborhood of New York. The child molestation trial against Jackson is scheduled to start 31 January, 2005, in Santa Maria, California. The star has denied 10 charges, including child molestation, plying a child with alcohol to seduce him and of conspiring to kidnap and falsely imprison a child and his family at his Neverland Ranch. He is free on a three million USD bail. AFP PHOTO/Doug KANTER/FILES (Photo credit should read DOUG KANTER/AFP/Getty Images)
LOS ANGELES, UNITED STATES: US pop singer Michael Jackson salutes the audience after recieving the Artist of the Century Award during the 29th Annual American Music Awards at the Shrine Auditorium in Los Angeles 09 January 2002. AFP PHOTO/Hector MATA (Photo credit should read HECTOR MATA/AFP/Getty Images)
NEW YORK, UNITED STATES: US singer Michael Jackson and guitarist Dave Navaro perform during the Democratic National Committee (DNC) benefit concert, 'A Night at the Apollo', at the world-famous Apollo Theater 24 April 2002 in New York. The concert was to kick off a nationwide voter registration drive. AFP PHOTO/TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
404248 10: Musician Michael Jackson performs at the taping of 'American Bandstands 50th...A Celebration' television special honoring the music show April 20, 2002 in Pasadena, CA. (Photo by Vince Bucci/Getty Images)
BERLIN - NOVEMBER 19: Singer Michael Jackson holds his son eight-month-old son Prince Michael II over the balcony of the Adlon Hotel November 19, 2002 in Berlin, Germany. Jackson is in Berlin with his three children to accept a lifetime achievement award. (Photo by Olaf Selchow/Getty Images)
BERLIN - NOVEMBER 19: Singer Michael Jackson appears at the balcony of the Adlon Hotel with an unidentified child November 19, 2002 in Berlin, Germany. Jackson is in Berlin with his three children to accept a lifetime achievement award. (Photo by Olaf Selchow/Getty Images)
SOWETO, SOUTH AFRICA - JULY 18: US musician Michael Jackson holds a child 18 July in Soweto, South Africa, where he laid a wreath at the memorial for students who died in an uprising on 16 June. Jackson sang a happy birthday song to South African President Nelson Mandela at a surprise meeting with the president shortly after he arrived in the country. AFP PHOTO (Photo credit should read WALTER DHLADHLA/AFP/Getty Images)
SANTA MARIA, UNITED STATES: (FILES) This 13 November, 2002, file photo shows pop singer Michael Jackson arriving inside the Santa Maria Superior Court for a trial in which he is accused of canceling concert appearances and costing the promoter several million dollars. The child molestation trial against Jackson is scheduled to start 31 January, 2005, in Santa Maria, California. The star has denied 10 charges, including child molestation, plying a child with alcohol to seduce him and of conspiring to kidnap and falsely imprison a child and his family at his Neverland Ranch. He is free on a three million USD bail. POOL/SPENCER WEINER/FILES (Photo credit should read SPENCER WEINER/AFP/Getty Images)
SANTA MARIA, CA - NOVEMBER 14: Musician Michael Jackson signs autographs for fans as he arrives at his civil trial in Santa Maria Superior Court November 14, 2002 in Santa Maria, California. The artist is being sued for $21 million by his longtime promoter for backing out of two concerts. (Photo by Bryan Chan-Pool/Getty Images)
SANTA MARIA, CA - NOVEMBER 15: Pop star Michael Jackson testifies during his civil trial in Santa Maria Superior Court on November 15, 2002 in Santa Maria, California. The pop star is being sued for $21 million by his longtime promoter for backing out of two concerts. (Photo by Ed Souza-Pool/Getty Images)
SANTA MARIA, CA - DECEMBER 4: Singer Michael Jackson testifies during the morning session of his civil trial in Santa Maria Superior Court on December 4, 2002 in Santa Maria, California. The artist is being sued for $21 million by his longtime promoter for backing out of two concerts. (Photo by Jim Ruyman-Pool/Getty Images)
LAS VEGAS - OCTOBER 27: (TABLOIDS OUT) Singer Beyonce' Knowles and singer Michael Jackson, winner of the 2003 Humanitarian Award, hug onstage at The 2003 Radio Music Awards at the Aladdin Casino Resort October 27, 2003 in Las Vegas, Neveda. For more information on Jackson's humanitarian efforts, go to musicforgiving.org. (Photos by Kevin Winter/Getty Images)
SANTA MARIA, CA - APRIL 30: Singer Michael Jackson gestures while departing the courthouse after his arraignment on April 30, 2004 in Santa Maria, California. Jackson plead not guilty to the grand jury indictment of numerous child molestation charges. (Photo by David McNew/Getty Images)
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