Son's boyfriend is being abused by his aunt. What can I do to help?

Tough choice.. My best figure would be hes 16 and will address the situation as he sees fit.. Child svcs can become a nusense or however you spell it, and cause just as much more hell in his life as what hes got now.. He is old enough to move out on his own in most states, and knows you have offered a place.. Remind him if the offer stands open, and if he trusts you, be there to listen and advise him