entimus

Its been a while since I last wrote here.
Ive been working with my dad, and tryin to work with my cousin. Weve tried to work together before, and it always ended up in fights. My cousin has a problem dealing with people. He has ended many friendships trying to work with friends. To be realistic, his friends end their relations with him.
Now, we were working just fine, until his gf returned... they were broken up, and she came back. Shes a maniac depressive with double personality. She makes my cousin spend money in concerts, trips, etc... and she does nothing for her life... she just lives to be sorry for her self and to make others miserable.
I hate her so much.
I cant contact my cousin because hes all the time with her... and hes somewhat ashamed of being with her, because he hides her from everyone.
Any ideas in how to get rid of the bitch?