Jason is Mason's twin brother in Dog With a Blog. He's portrayed by Griffin's twin brother, Aaron Kunitz.
Jason's personality is similar to his brother, he proves to be absent-minded.
- He and Mason go to different schools because their parents wanted them to be individuals.
- He and Mason wear the same clothes to which they question how do they got into them.
- Jason once did Mason's running gag of running into a random place spouting "How did I get here?".
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