In "Hamelot" the farm gang were wearing swimsuits to take a shower. It would've been understandable if they were wearing swimsuits just for show and to go swimming. But wearing swimsuits to take a shower, when you need your clothes off anyway?
Maybe it hasn't occurred to them that they're all naked anyway.
Since when did Jon had a niece(from "Suburban Jungle"). He has one sibling and he's not married. Maybe Doc Boy adopted her?
He was also once going to mail a stuffed cat to his cousin. Perhaps it's one generation back - either his mom or dad had siblings and thats where these relatives are coming from.
Played for laughs in an episode of Garfield and Friends in which Garfield explains different Comedy Tropes. The example given for the "extreme delayed reaction take" is Booker telling Bo that Earth is being invaded by aliens disguised as bottles of dishwashing liquid. No reaction. Months pass. Then, one snowy day the following winter, Bo suddenly stops dead and says, "Dishwashing liquid?! Aw no, man!!" and flees in terror.