The clash of worlds

Although my friend Le Kim asked me not to tell anyone, I need to vent.
His sister is having problems with her asshole of a husband. The mom was there in the US to visit her daughter and new born granddaughter.
Yesterday, (details still unknown to me) the husband started throwing pampers at the mom, started throwing her clothes out and yelling, "get out of my house" - I would like to point out, that the house belongs to Le Kim's family and he had no right to throw the mom out.
I didn't make things better by saying that I was no good when it came to family violence - I don't know what to do. Or even if I was any help. I remembered a friend who got hit with a chair. Didn't know what to do then. Still don't know what to do now.
He's scared and frustrated. He doesn't know what to do. He doesn't know how to help. - That's just killing him. The fear comes from the uncertainty of how things will turn out. He dreads having to hear the call that one day a member of his family would be hurt.
Wow, the rain is really pouring down, I guess I better get going, even if I didn't finish this. Maybe I'll do this at home.
I'm just so upset that I tried telling this story to Leo. I don't think I was even able to convey how upsetting this story is when he comes down with his strictness that for a newly made family its best if noone interfers. Yes, I agree with that, however, we're talking about a newly born baby, its but natural that the parents go visit and help out the family while they are adjusting. Maybe its a cultural thing. I grew up with people living with us. For Leo, its been solidly just his parents. But if I get married and have a kid here, my mom (for sure) would want to come visit and help out-not necessarily interfer. Since the Philippines is far from Rome, she'd stay a month maybe even two. For Leo that's intrusion and he wouldn't stand for it. She could stay a week - maybe two but not more than that.
It's just a cultural thing I guess. We haven't had much examples to experiment on, so I'm not sure how we will get along. But now, he just sent a message:
We will always make decisions togheter, about anything. We will have to respect each others needs. It will all be ok, because we love each other. I love you.