Yes go for it.
Your wife's brother is your brother-in-law.
Brother in-law.
your brother in-law and your sister in-law
No. Why should it??
What your mother says you should never do is HIT your brother. The answer is hit
the man's brother-in-law
If your brother is a criminal you should call the police and ask them what to do from there.
It should be--- You and your brother hid in the kitchen.
YES!
You should trust your girlfriend and if she loves you she will ignore her brother providing you are treating her with respect. If she does not stand up for you and her brother continues to try to break you up she should either stand up to him or, if a minor she should talk to her parents about what her brother is up to.
maybe you should just let her know how you feel
Love them.