Larry,
You certainly are in a bind
I personally would approach thier Mother
and explain to her first what is going on (as you believe it to be) I would
explain if things persist you have done your best to keep peace and the next
step I would explain will be measures you both would rather not see come to
pass. Contact the Police. As long as you allow it to go on it will only
escalate until your back is completely against the wall and you may end up
doing something both parties will regret? let thier mother know that and if
she cant resolve the matter you will be forced to report it to the police.
dont be a victim of your own home.. I think you owe it to yourself as well as
your family to resolve the matter quickly and swiftly.
Best of luck my friend !
------------------
Walk lightly my friend.