I doubt it.
Tad would have been in on it. He would know how sadistic Gary was and wouldn't have let the Preps attack Jimmy... or would he?
I know, I was just kidding. Well, it's not like Smith is uncommon or anything, but they could've chose a better name for Tad or Gary.
Wait...Gary might've had Tad's key to break into his yard on "The Eggs" because they're related! ...Nah.
Edit: Found possibly two more -
Karen and Fatty, and Gloria (and possibly) Bo.