It sucks doesn't it? I cut my mum out quite a few years ago. At most family get togethers, if she turns up (Christmas, nieces & nephews birthday's) I say hello, am polite but avoid engaging with her in a lengthy conversation as I just have no interest in pretending everything's ok when it's not. Both my brothers & my daughter have occasional contact with her but everyone knows I've tried my best & it just doesn't work so no one gives me grief about it anymore.