Jason Mars (born April 20, 1999 - Died aged 10) is the son of Ethan Mars
and Grace Mars
and brother of Shaun Mars
. Jason Mars was killed in a car accident, after wandering away from Ethan
, during his birthday whilst shopping at a shopping centre. Ethan Mars
jumps out in a bid to save Jason, he took most of the impact from the car but Jason still died later on.
Jason's death was probably related to Grace Mars and Ethan Mars' divorce. Ethan later has a hallucination of Jason holding the same red balloon he was holding when he got knocked down by a car. It was this which made Ethan that Jason is gone forever.