That's also a possibility. I have to reduce the amount of cousins that I play in some way, but I could give the remaining ones their own challenges. Possibly I could also, as per Lenny's suggestion, take those cousins (and their challenges) to another 'hood. That way I wouldn't have to worry about keeping in sync. Hmm...

Thanks, I'll add that to the list of options that I'm composing! :)