My brother and his girl won't stop being nasty. I want them to stop. I think it's disrespectful to my parents house. What should i do? Or what should i tell my parents?

Here's some suggestions on what you can do;

Try to communicate your feelings to them by initiating a conversation or series of conversations to discuss your own boundaries and to listen to theirs. Manage your reactions If your brother is defensive, petulant, passive-aggressive, or critical, simply smile or excuse yourself from the room. Manage your interactions