You should do whatever you want to. Don’t let your mother guilt trip you into cutting off a family member due to beef she has with him (regardless of whether it’s justified).

It’s frustrating to hear about parents treating their children like pawns in a break-up. I can see the temptation but it’s extremely unfair. Regardless of what people will tell you on lemmy/reddit losing contact with a parent is not a normal thing, even if some people have cut off their family members in extreme circumstances.