Girls, My boyfriend's sister is crazy, what do I do?

Anonymous
I have been with my boyfriend for a year now and I really love him but his little sister is a psycho. Let me tell you how psycho..

She always screams and yells at him and when she is mad she punches and kicks him, he is quite a bit bigger then her so usually she doesn't hurt him but earlier last night she stormed into his bedroom while we were cuddling and yelled at him for using her towel (which was an accident and it was actually me at used it because he got it out of the cupboard for me)

He was trying to explain what happened but she just yelled louder and slapped him in the face and then when he grabbed his face, she punches him in his testicles!! REALLY HARD! then she spat at him and walked out and said "have fun making babies her now with those, bitch" and then slammed the door.

I have never seen him cry from anything since we started dating but he was curled in a ball crying and heaving and sweating it was horrific to see! And it lasted for hours! I would love to be able to have children with him one day so I really don't want her to do that again...

I talked to him about it this morning and he said he is afraid of her and his Mom always takes her side... What do we do and from what I just told you, do you think she is an actual psychopath?
Girls, My boyfriend's sister is crazy, what do I do?
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