In Greg the Babysitter, Vidalia’s babysitter can’t work because of a “death in the family” (which is revealed to be a hamster).
Vidalia also mentions that this babysitter is 12 years old at the time, which means they’re about 12-13 years older than Sour Cream. If Sour Cream is currently somewhere between 15-18, this would mean the babysitter is currently in their late 20s, early 30s. Most people in the show are either “parent age” (Greg, Vidalia, Mayor Dewey), “teen age” (Sadie, Cool Kids, Ronaldo), or “kids age” (Connie, Onion, Petey). This leaves but one option:
Which leads me to the most important fact in the entire show: Jamie the Mailman used to have a hamster.
So last year in my government class a beetle managed to get into the room and one of the kids killed it. My teacher took the bug, set it on the chalkboard chalk holder thing and had us stand up with our hands on our hearts while he played Taps and gave the bug an epitaph.