Jason Ritter
Jason Morgan Ritter is an American actor, and the son of actress Nancy Morgan and late actor John Ritter, known for his roles as Kevin Girardi in the television series Joan of Arcadia, as Sean Walker in the NBC series The Event, and as the voice of Dipper Pines in Gravity Falls. He also played the recurring role of Mark Cyr in the NBC television series Parenthood, for which he received an Emmy Award nomination.
Ritter was born on February 17, 1980 in Los Angeles, California, the son of actors Nancy Morgan and John Ritter , and the grandson of musicianactor, Tex Ritter and Dorothy Fay. His stepmother is actress Amy Yasbeck. He has three siblings, including actor Tyler Ritter.
Source: Wikipedia