I went on holiday for a week in September with DM and DGM. DM paid for all three of us (her treat).
DGM has form for being rude and selfish, she was actually pretty horrible on holiday, especially to my mother. I reached the conclusion watching her behaviour on holiday that she's actually a narcissistic mother (to my DM).
Anyway - there were fallouts throughout the holiday. I tried to bite my tongue for most of the week but on the last morning she was being so horrible to my DM I lost my cool and called her out on her behaviour.
We don't live near to each other so my tactic was simply going to be to keep my distance but otherwise remain civil and pleasant. I bought her Xmas gifts as per usual (thankfully we are with DH's family this year).
Grandmother hasn't got me anything - not even a card which seems dreadfully petty.
She's continuing being vile to my DM during their weekly visits (I am 200 miles away so not there).
Her birthday is in early Jan. My feeling is that I now don't want to get her a card/gift, I don't want to be petty but actually I just feel a bit 'done' with her.
How would you handle this?
If relevant: I'm 37, DM is 56, DGM is 75 (fit as a fiddle, no health issues).