It's been 25 years since my mum died (I was 13), one of my brothers never really grieved at the time and has had counselling and would like a gathering to reflect and share about mum, to provide closure.
The problem is our dad is very deaf and has severe anxiety. He lip reads and can understand conversations with difficulty. He remarried 2 years after mum died. SM is a 'difficult' person, we tolerate her. Dad doesn't want to travel to attend (3.5 hours, my DB is happy to travel and chauffer him) without her at the gathering.
AIBU to not want her there, even if it means dad doesn't attend? I feel like she'll be sitting in the corner judging and if dad gets choked up or sentimental that she'll be angry at him. She's very insecure.
It would also probably mean moving the gathering to closer to dad and therefore not have wider family there.
YABU - it's important we make sure dad is included, even if that means SM comes too.
YANBU - its more important I and my brothers are comfortable to open up at the service than for my dad to be there.