He has a brother who treats his mother with harshness; should he boycott him or continue advising him?

Question:
May Allah reward you. His third and final question says: What must I do if I find my elder brother treating my mother with harshness? I have advised him twice, but he did not listen to my advice. Should I cut off relations with him, or what should I do? Please guide us. May Allah reward you with good.

Answer:
You must advise him and warn him of the anger of Allah (Glorified and Exalted is He). If he does not comply and you see that boycotting him and cutting off relations with him will have an effect on him, causing him to feel ashamed and repent, then you should boycott him and cut off relations with him until he repents. However, if this has no effect on him, then you should not boycott him or cut off relations with him, but rather continue advising him, perhaps Allah will guide him. Yes.