There's nothing wrong with you wanting your cats to be respected in their own home. And if this is a recurring problem, you have every right to be upset. Give it a couple days for everyone to calm down, call your mom and explain to her why you feel the way you do. Maybe Reinhold will FINALLY get it through his head that while he is welcome to come into your home, he is not welcome to tease and torture your kitties.

I don't think that is out-of-line for you to ask.