NC for obvious reasons... my DM frequently laments that me and my sister don't get on. We are very different people - literally chalk and cheese with different opinions on everything. As children I adored her and she really took advantage of that relationship and I learnt to be more independent in my teens. As the years go by, I have grown to realise that I just don't really enjoy spending time with her. So, AIBU to think I shouldn't have to get on with my sibling once we are adults?
Also would be curious to know your sibling relationships in adulthood vs childhood.
YABU - she is your sibling, you should get on.
YANBU - you don't have to get on with people just because they are your sibling.