Two of our male guests got into a fight fight at our reception after both had had too much to drink. Their wives have since acted no better. One has tried to apologize (we just can't talk to him quite yet after what he did (he's family)) and the other believes that somehow WE owe him an apology (???) (he's not family). Do I send thank you notes to them for gifts they gave? If so, what do I say?