He is also the grandson of actor and musician Tex Ritter (voice of Big Al), and the oldest son of late actor and comedian John Ritter and older brother of singer/actress Carly Ritter and actor Tyler Ritter and half-brother of Stella Ritter.
Jason Ritter with his father John in February 2003.
Jason Ritter with his sister Carly, brother Tyler, and their mother Nancy Morgan in March 2011.
Jason Ritter with his half-sister Stella and stepmother Amy Yasbeck at the Team Ritter Memorial Fund in November 2012.
Jason Ritter and David Cross attending the 2014 Sundance Film Fest.
Jason Ritter attending the 2014 Radio Disney Music Awards.
Jason, Tyler and Carly Ritter with sister-in-law Lelia Parma attending the 30th Annual AIDS Walk in October 2014.
Jason Ritter attending the 2016 Toronto International Film Fest.
Jason Ritter and Linda Cardellini appear in the Gravity Falls episode "Weirdmageddon", when Dipper and Wendy are turned into their respective voice actors dressed as them in live-action.
Jason Ritter and JoAnna Garcia speak onstage during the Kevin (Probably) Saves the World panel at the Summer 2017 TCA Press Tour.
Jason Ritter visiting Jimmy Kimmel Live in January 2018.
Jason Ritter attending the 2018 Tribeca Film Fest.