I'm planning on cutting my brother and his girlfriend out of my life
Why do you think that you are better off without them?
It's hard to live with my brother and his girlfriend, they're too rowdy.
You shouldn't cut your brother out of your life over their rowdiness. If they are too rowdy then you should not party with them but not cut them off completely.
They're making my job harder.
I still think that you should try to mend the relationship. I think that it is good to work on it to see if it can be saved first.