NC'd.
I have 2 DCs, DS and DD. My parents have 4 GCs in total: DS is the eldest GC, DD is the 3rd. DSis's DS is the 2nd and DBro's DD is the 4th. My DM massively favours boys over girls - always has and always will. Both my DBro's moved abroad and my DSis and DM butt heads regularly (no hostility, just difference of opinions and values - no one is right or wrong, just different) - so, I see my DM most often. It also falls to me to sort Mother's Day, DM's birthday, Christmas, Easter etc - I'd obviously like her to have nice gifts/lunches/experiences/etc but I do feel I shouldn't have the full burden of organising and cost.
DS adores DM and she doted on him. When it was just DS and DN1, DM treated them equally and loved them both and it was fine. Then, when DD came along, I felt very anxious about DM favouring the boys. There were a few teething issues with DM. With DN2 also being a girl, I thought DM would treat them equally but I think because she's DBro's DD and DM favours DBro over me/DSis, DN is very firmly the favourite and it's very clear.
How would you navigate this? I love DM but her biggest flaw is that she does have an explosive temper in response to criticism or perceived criticism so I don't want to kick anything off.