My brother's wife is a very bad mannered woman. I think she is a Narc and feel I can see straight through her when the rest of the wider family can't. My brother, who I had close relations with up until he married her is under the thumb in a big way.
Over Christmas she completely ignored my husband and I despite us changing our plans so we could overlap with them. We have 3 small kids and ended up impacting on their Christmas just to keep the peace with my parents. She is very rude and clearly hates my husband and I. She ignored us in my own parents house which I thought showed a real brass neck. If another family member was present she would respond to us if we spoke to her. I really don't know who she thinks she is; she really did show her true colours.
The problem is is that my brother has married his mother - and there is quite a harem thing going on. It is fairly intolerable.
My sister in law is arranging a small birthday lunch for my brother 100 miles away and I am on the list to attend. After her performance over Christmas I don't want to drag my family into another toxic situation but I do feel a sense of obligation. If nothing else to keep my parents happy who are elderly.
If I don't go I would feed into her narrative that my husband and I are horrible people . If I do go I expose myself and my family to the toxicity again.
What to do? Please be kind!