My half brother turned his back on our WHOLE family because his B*** of a wife.

my brother is 30 

His wife is 25 

They have been together 2 years and after they got married everything started going down hill.
 She HATES my mother ( Who has been like a mother to my half brother) and won't let mum or dad see their granddaughter. She abuses him financially... He sold the house first thing she did was buy 2 horses and new saddles and other stuff. The money was gone with in a few months and they are having a hard time making the rent payments.. now they are building "their" dream house. It's really her dream house and it's in the location SHE wants. She makes him work so she can stay at home and do NO house work and play with her horses and drop their daughter off with her mum all day. He is a car salesman and She worked at cosco. I feel as if I am stuck in the middle. I went to their new place yesterday and felt sick to my tummy cause I hate her and I was being fake to her to keep my brother happy, The worst part is.. We just met him 3 years ago. So my question is.. how can I help get my family back together or should I just forget my brother and not speek to him?... Please help
user
My brother turned his back on
assistant
My half brother turned his back on our WHOLE family because his B*** of a wife.

my brother is 30 

His wife is 25 

They have been together 2 years and after they got married everything started going down hill.
 She HATES my mother ( Who has been like a mother to my half brother) and won't let mum or dad see their granddaughter. She abuses him financially... He sold the house first thing she did was buy 2 horses and new saddles and other stuff. The money was gone with in a few months and they are having a hard time making the rent payments.. now they are building "their" dream house. It's really her dream house and it's in the location SHE wants. She makes him work so she can stay at home and do NO house work and play with her horses and drop their daughter off with her mum all day. He is a car salesman and She worked at cosco. I feel as if I am stuck in the middle. I went to their new place yesterday and felt sick to my tummy cause I hate her and I was being fake to her to keep my brother happy, The worst part is.. We just met him 3 years ago. So my question is.. how can I help get my family back together or should I just forget my brother and not speek to him?... Please help
user
Brother is in the middle of
assistant