Why do women criticize strangers for domestic abuse against women while maintaining a good relationship with a family member who has done the same?

There’s a woman I know whose brother is a convicted domestic abuser and has been violent towards women on multiple occasions. Despite this, she still gets along well with him and maintains a good relationship with him. She also commented on a Facebook post about one of my friends being a domestic abuser and called him a “scumbag.” She doesn’t know my friend at all and has never met him, yet she was quick to condemn him based on what he had done. I’m not defending my friend’s actions, but I don’t understand why she is so willing to judge someone she doesn’t know for domestic abuse while continuing to have a good relationship with her own brother, who has done the same thing on multiple occasions. It feels like a clear double standard.
Why do women criticize strangers for domestic abuse against women while maintaining a good relationship with a family member who has done the same?
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