My dm is at times, nasty but I make allowances for her because DF died some years ago and she is lonely and her health isn't great. I tolerate her and fulfil my obligations.
I live 40 mins away from her. DB and his wife live 5 mins away from her.
My DB children with ex wife always spend Christmas with EX wife and her parents since they split and before they split as a family.
Presumed it was a case this year. My dm has just found out that her son (my db) and grandchildren are spending the day with their stepmum's parents and family leaving my dm alone. She's coming to me and my family for boxing day. DB and new wife don't and won't be having children.
My dm is upset that db wasn't up front with her about the arrangements etc and finds it upsetting that for years she had been usurped by maternal family but accepted it, but now is usurped by non biological grandparents.
Because DB never deals with DM and her issues nor does he see it as any obligations, he has left dm upset on Christmas day and therefore leaves me with the task have dealing with this shit when she arrives at mine tomorrow, probably ruining boxing day for me, my dh and dc.
So cross with DB and sil.