I've been fortunate that I don't really get asked to do things considered overly personal. Sure, I've written letters or make phone calls for personal business for the boss, but as far as running errands, unless I'm already going that way, I don't even get asked.
But on the flip side, they've handled personal issues for me. These were favors done out of kindness so being asked to the do the occasional personal thing has never bothered me with these folks. As long as it doesn't become "expected" and the reciprocation is there, I don't mind it at all.
Michelle
