First off I am sorry your son is hurt and I hope that is not broken. As a mamma bear myself I can understand your anger. I personally wouldnt ask for any compensation just because I would feel since it happened at my house and I let them rough house I would be responsible and accidents do happen. But I understand completely the angry mamma bear feeling
As far as the other issues in this thread, I think that they are good points to make but it wasnt the original question and I think leggomom may feel personally attacked, as I was in my Santa clause thread, and it is not a good feeling when you come for support.