Given that limited information, one might conclude that Toby’s humor and goofy nature comes from his father, who we know nothing about.
Isaac Aptaker gave no word on whether or not Toby’s brother who skipped out on the bachelor party will be attending, but did tease This Is Us fans with the appearance of Toby’s parents.
Toby generally seems to be a person from a good and stable family, so one would imagine his parents won’t be the type to cause a scene and wreck the wedding.
Fans already know a bit about Toby’s mother, as Toby was afraid to tell his devout Catholic mama he had gotten Kate (who eventually miscarried) pregnant before they were married.