I'm upset angry and worried about my brother. What do I do?

I'm upset because my brother is blind to what his fiance does. She gets very angry at him, says he can't do anything write and boses him about like he's her slave.

I'm angry because he won't listen to us. He just defends her. To him anything she does is her messing around.

I'm worried because I want him to be happy. For him to be with someone who treats him right and who makes him happy.

Some of the things she does and say i have cried over. I haven't told my brother that. She acts all bright and bubbly around relatives and friends. Around me she is dead quiet.

She goes mad if my brother is late or if he messes around.

Updates
7 mo
Her and her mother won't let him do his ironing, cook or clean. He tries to help them but her and her family won't let him
Updates
7 mo
He ignores me a lot. Whenever he is around all talks about is her. She treats him awful and doesn't care.
I'm upset angry and worried about my brother. What do I do?
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