Would you cut ties with a family member?

There’s a dispute happening between how my brother wife mistreated and disrespected all of us including him. We all in the group chat feeling disgusted and used. She mistreated our sister and basically used her. As a matter of fact, she used all of us. when it came to information regarding my brother and turning her people against our sister, she was all in for it. We cut her off because of the text messages her friends showed us. She called us all out of our names and said she just wanted us for information. Her excuse for mistreating my sister was “she didn’t have kids, married or have a family” she basically singled her out and all we ever did was try to help her. However, my brother said that she talks to other people without kids and family. So he basically didn’t understand why it’s always his family that gets stomped on by her disrespectfully. She would be happy with her other friends, but treat our sister like crap. We were there emotionally and everything to help this coworker. Our coworkers even got crapped on by her when he cut off communication with her. Our mom was disrespected by this girl and called my brother all sort of names. Whenever she doesn’t get her way, it’s always the hate that she shows. Our brother has his own place right now because it took him this long to see the girl he married. our mom don’t understand why she treat us so badly and treat the people that’s filled with drama good. how is it fun using somebody?
Would you cut ties with a family member?
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