Suggestion on my brother's marital life?

How is she restricting him from talking to his parents if they are separated? That doesn't make any sense. And she can't MAKE him move out of the house. Also doesn't make any sense. If she was going to commit suicide, she'd already be dead. So he should stop falling for the okie-doke. And you all CAN'T do anything about it. It's HIS marriage. As for the suicide threats, take her seriously enough to make a note of it. But no need to fall all over yourself about it. Truly suicidal people RARELY make constant threats. They make ATTEMPTS. Until she does that, I'd say no worries on that front. He should be the one filing case against her!