is his son alright? which one should go the father or the son? if he has to go to the hospital the son must be hurt too...both should go!!!
His son should go to the police station and adult protective services (if he isunder 18) and file charges against him with the district attorney (if over 18), not necessarily in that order.
I cannot conceive of any circumstance where a father would need to punch his son in the head.
As for your boyfriend, on the one hand, something tells me he deserves to end up with a permanantly disfigured and painful hand, he has to earn a living, so a trip to the ER would be appropriate.
go to the hospital to be on the save side gd luck x