Did you get any email or other contact from US Airways? And when you say a "rash" of family accounts, did each account have a unique, individual person assigned to it?
It is entirely possible they could cancel your outstanding ticket(s). I wouldn't want to chance it any show up at the airport with a canceled itinerary.
So, it's probably best you start working with them to show that the shares/transfers were legit (assuming they are). There were some other stories like this over the past year that might give you some guidance.
http://www.flyertalk.com/forum/us-ai...ighlight=audit