The actresses are the daughters of Eddie Fisher. Joely's mother is actress Connie Stevens, and Carrie's mom is actress Debbie Reynolds, who died a day after her daughter.
Airing on Star Wars Day, May the Fourth Be With You, Joely opens up on Dr. Oz about her sister's legacy, and their last conversations with one another prior to Carrie suffering a heart attack on a flight from London back to the U.S.
"I saw her in November for her [60th] birthday and we had a grand time, the typical Carrie party," Joely recalls of her older sibling, adding that their last conversation was over text message. "[The texts] were from the night before she got on her fateful flight and I've saved them, screen shotted, backed them up onto, you know, other hard drives because, you know, I don't ever want to lose them. We talked about politics. We talked about our mothers, who were frail, both of them. And, our children and promised to see each other at Christmas, which I upheld. I was there... I think she knew I was there."
See photos of Carrie Fisher:
Carrie Fisher's best red carpet moments
Carrie Fisher's best red carpet moments
Carrie Fisher during Carrie Fisher Sighting at Chasen's Restaurant in Beverly Hills - April 8, 1975 at Chasen's Restaurant in Beverly Hills, California, United States. (Photo by Ron Galella/WireImage)
Carrie Fisher and Paul Simon (Photo by Tom Wargacki/WireImage)
NEW YORK, NY - CIRCA 1980: Paul Simon and Carrie Fisher circa 1980 in New York City. (Photo by Robin Platzer/IMAGES/Getty Images)
NEW YORK CITY - SEPTEMBER 16: Carrie Fisher attends Giorgio Armani Fashion Show on September 16, 1980 at the RCA Promenade in New York City. (Photo by Ron Galella, Ltd./WireImage)
Dr. Arnold Klein and Carrie Fisher (Photo by Ron Galella, Ltd./WireImage)
LOS ANGELES - CIRCA 1989: Brother and sister actors Carrie Fisher and Todd Fisher pose for a portrait at an event in circa 1989 in Los Angeles, California. (Photo by Maureen Donaldson/Michael Ochs Archives/Getty Images)
Carrie Fisher during 5th Annual American Cinematheque Ball Honoring Ron Howard at Century Plaza Hotel in Century City, CA, United States. (Photo by Ron Galella/WireImage)
Gore Vidal and Carrie Fisher during New Yorker-Tina Brown All Movie Issue Party at Bel-Air Hotel in Bel-Air, California, United States. (Photo by Jim Smeal/WireImage)
Carrie Fisher during Artists Rights Foundation Honors Steven Spielberg with 1995 John Huston Award at Beverly Wilshire Hotel in Beverly Hills, California, United States. (Photo by SGranitz/WireImage)
Carrie Fisher during 'Stealing Beauty' Beverly Hills Premiere at Cecchi Gori Fine Arts Theatre in Beverly Hills, California, United States. (Photo by SGranitz/WireImage)
BEVERLY HILLS, CA - DECEMBER 2: Actress Beverly D'Angelo, actress Carrie Fisher and actress Holly Hunter attend the Third Annual Premiere Women in Hollywood Luncheon on December 2, 1996 at the Four Seasons Hotel in Beverly Hills, California. (Photo by Ron Galella, Ltd./WireImage)
WESTWOOD, CA - JANUARY 18: Actress Carrie Fisher and actress Sharon Stone attend the 'Star Wars' 20th Anniversary Screening on January 18, 1997 at Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
384639 01: 6/8/98 Westwood, CA. Carrie Fisher at the premiere of 'Six Days, Seven Nights.' (Photo by Brenda Chase/Liaison)
Carrie Fisher during 22nd Annual Women In Film Crystal Awards - June 19, 1998 at Century Plaza Hotel in Los Angeles, California, United States. (Photo by Ron Galella/WireImage)
(Original Caption) Carrie Fisher arrives. (Photo by Frank Trapper/Corbis via Getty Images)
(Original Caption) Arrival of Carrie Fisher with her daughter. (Photo by Frank Trapper/Corbis via Getty Images)
(Original Caption) Cindy Crawford, Earwin 'Magic' Johnson and Carrie Fisher. (Photo by Frank Trapper/Corbis via Getty Images)
Paul Mazursky & Carrie Fisher during Center to Prevent Handgun Violence Dinner at Pickford Estate in Beverly Hills, California, United States. (Photo by SGranitz/WireImage)
Carrie Fisher during American Film Institute Honors Harrison Ford with 2000 Lifetime Achievement Award at Beverly Hilton Hotel in Beverly Hills, California, United States. (Photo by SGranitz/WireImage)
Carrie Fisher during 11th Annual GLAAD Media Awards at Century Plaza Hotel in Los Angeles, California, United States. (Photo by SGranitz/WireImage)
Actress Carrie Fisher and Producer David Geffen attend the Beverly Hills Premiere of 'A Time to Kill' on July 9, 1996 at Academy Theatre in Beverly Hills, California. (Photo by Ron Galella, Ltd./WireImage)
Carrie Fisher (Photo by Jean-Paul Aussenard/WireImage)
Carrie Fisher during amfAR's 'Honoring With Pride' Benefit at Chelsea Piers in New York City, New York, United States. (Photo by J. Vespa/WireImage)
Carrie Fisher during Cirque du Soleil Presents Its Latest Touring Production, 'Varekai' at Staples Center in Los Angeles, California, United States. (Photo by SGranitz/WireImage)
BEVERLY HILLS, CA - MAY 20: Actor and author, Carrie Fisher attends the 38th Annual City of Lights Gala at the Beverly Hilton Hotel on May 20, 2004 in Beverly Hills, California. Actor Carrie Fisher was honored at the event. (Photo by Frederick M. Brown/Getty Images).
Pell James and Carrie Fisher during 'Undiscovered' Los Angeles Premiere - Red Carpet at Egyptian Theatre in Los Angeles, California, United States. (Photo by J.Sciulli/WireImage for LIONSGATE)
WESTWOOD, CA - MAY 1: Actress Carrie Fisher arrives at the Geffen Playhouse for Backstage at the Geffen Playhouse's Annual Gala featuring a star-studded lineup of celebrity performers and VIP guests celebrating the Geffen's past and present in the newly renovated Geffen Playhouse on May 1, 2006 in Westwood, California. (Photo by John M. Heller/Getty Images)
ATLANTA, GA - JUNE 1: Actress Carrie Fisher (R) embraces her mother Debbie Reynolds while walking down the red carpet to participate in 'Jane. Well Done. A Celebrity Roast of Jane Fonda' event at the Georgia Aquarium, June 1, 2006 in Atlanta, Georgia. The event benefits the Georgia Campaign for Adolescent Pregnancy Prevention. (Photo by Erik Lesser/Getty Images)
STUDIO CITY, CA - AUGUST 13: Actress Carrie Fisher arrives at the Comedy Central Roast of William Shatner held at CBS Radford Studios on August 13, 2006 in Studio City, California. (Photo by Kevin Winter/Getty Images)
Carrie Fisher (Photo by Dimitrios Kambouris/WireImage)
WASHINGTON - JANUARY 18: Author Nikki Grimes attends Pajama Program's Obama Pajama Party Inauguration Charity Ball to Benefit Children in Need at Ronald Reagan Building on January 18, 2009 in Washington , D.C. (Photo by Ilya Dreyvitser/WireImage for Pajama Program)
Carrie Fisher arrives for the 'Wishful Drinking' - Los Angeles Premiere at Linwood Dunn Theater at the Pickford Center for Motion Study on December 7, 2010 in Hollywood, California. (Photo by Jonathan Leibson/FilmMagic)
LOS ANGELES, CA - FEBRUARY 23: Actress Carrie Fisher (R) arrives to the premiere of Warner Bros. Pictures' 'Hall Pass' on February 23, 2011 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)
NEW YORK, NY - NOVEMBER 03: Carrie Fisher attends the 2011 Silver Hill Hospital gala at Cipriani 42nd Street on November 3, 2011 in New York City. (Photo by Andy Kropa/Getty Images)
BEVERLY HILLS, CA - JUNE 16: Actress Carrie Fisher speaks onstage during the 40th Annual Daytime Emmy Awards at the Beverly Hilton Hotel on June 16, 2013 in Beverly Hills, California. 23774_001_2260.JPG (Photo by Michael Buckner/WireImage)
NORTH HOLLYWOOD, CA - MAY 14: (L-R) Carrie Fisher and Debbie Reynolds attend the all-star gala and press preview of Profiles in History's Debbie Reynolds-The Auction Finale at Debbie Reynolds's Dance Studio on May 14, 2014 in North Hollywood, California. (Photo by Earl Gibson III/WireImage)
BEVERLY HILLS, CA - SEPTEMBER 30: Actress Carrie Fisher attends the Midnight Mission's 100 year anniversary Golden Heart Gala held at the Beverly Wilshire Four Seasons Hotel on September 30, 2014 in Beverly Hills, California. (Photo by Tommaso Boddi/WireImage)
LOS ANGELES, CA - JANUARY 25: Honoree Debbie Reynolds (L) and actress Carrie Fisher pose in the press room at the 21st Annual Screen Actors Guild Awards at The Shrine Auditorium on January 25, 2015 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
SANTA MONICA, CA - FEBRUARY 19: Actress Carrie Fisher attends the US-Ireland Alliance Pre-Academy Awards Honors event at Bad Robot on February 19, 2015 in Santa Monica, California. (Photo by Paul Archuleta/FilmMagic)
HOLLYWOOD, CA - NOVEMBER 14: Actress Carrie Fisher attends the 7th annual Governors Awards at The Ray Dolby Ballroom at Hollywood & Highland Center on November 14, 2015 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
LONDON, ENGLAND - DECEMBER 16: Carrie Fisher attends the European Premiere of 'Star Wars: The Force Awakens' at Leicester Square on December 16, 2015 in London, England. (Photo by Karwai Tang/WireImage)
CANNES, FRANCE - MAY 14: Carrie Fisher and her dog Gary attend the 'Mademoiselle (Agassi/The Handmaiden)') Premiere at the annual 69th Cannes Film Festival at Palais des Festivals on May 14, 2016 in Cannes, France. (Photo by Stephane Cardinale - Corbis/Corbis via Getty Images)
NEW YORK, NY - OCTOBER 10: Actress Carrie Fisher attends the 54th New York Film Festival 'Bright Lights' screening at Alice Tully Hall on October 10, 2016 in New York City. (Photo by CJ Rivera/FilmMagic)
Carrie died on Dec. 27, but was hospitalized before Christmas Eve. Joely admits that it hasn't been easy going on with life without her sister. "I miss her around," she says. "I miss being able to call and, you know, make a joke about politics, frankly, anything."
Joely's hope is to be an inspiration to others just like her sister. "I think you either go dark or you go funny. ...You could lose yourself in tragedy and in sort of your own demons and she was determined not to," she says of the Star Wars actress. "I'm finding that, you know, not only were people fans, they looked to her for solace and for finding the funny and for knowing that if she could survive, that they could. And with her not surviving, they're looking for me."
Also on Dr. Oz, The Insider's Michael Yo talks about how fans are coping months after Carrie's death. "When we heard she survived in the plane and made it to the hospital and was fighting, fighting, fighting, a lot of fans and a lot of people that loved her felt like we had hope that she was gonna win," he notes. "Then we heard that fateful news, it was just a tragic turn and a lot of people are still trying to cope with it."