My SIL is similar to this. Basically what she wants is to make sure she has MIL all to herself.
SIL would probably be ok with being allowed to be the dominant character for a while with us in attendance and obedient, but a) I’m not going to do that and b) even then the ante would just be upped and upped to push others away.
There’s a limit to what people can do in these circumstances, especially if what SIL actually wants is to have her parents all to herself and push your and you DH and DC out.
MIL has never stood up to my SIL about her behaviour for a few reasons.
Firstly, they had a very troubled time when SIL was a teenager and both ended up in antidepressants and MIL doesn’t want to go back to that level of fighting. Secondly, MIL likes seeing her grandkids and SIL has been known to use this as a weapon. Thirdly, MIL wants to rely on SIL in old age. She’s very mindful of “a son is a son til he finds him a wife, but a daughter is yours for the rest of your life”.
FIL did stand up to SIL when he was alive. Mostly just by not doing what she wanted or by siding with the person she was taking a pick at (so he would have given your DD his mousse and then gone to sit beside DD/given DD all his attention). And that did work temporarily but she’d always just move on to someone else or do stuff when he wasn’t around to see.
DH does stand up to SIL, both in the moment and by having a word. It works for a short while but the behaviour always resurfaces.
BIL even stands up to SIL, usually just by not going along with things, sometimes by calling her out,
sometimes by trying to counter her behaviour. But it doesn’t seem to stop her although it makes it better in the moment.
His parents and brother&wife basically stopped having anything to do with SIL, so it means SIL goes to MIL (or vice versa) for every special occasion.
And this is exactly what SIL wants. She wants her mum all to herself (when FIL was alive it was that she wanted her parents all to herself). She was like that with DH when they were kids too (she is a couple of years older).
When someone is set on something like that, it’s very, very difficult to do something about it.
If the person or people who are the “object of affection” are aware of it and take a very strong line there is some hope, but if not it’s really hard.
By this I mean, it would need your PIL to stand up to SIL’s behaviour in a very strong way. Basically saying something like “if you can’t behave we’ll need to do alternate years for Christmas/Easter”. Even then the passive aggression or open aggression would likely come at you in other forms.
TBF, MIL is right in a way, SIL is and will be a lot more involved than DH. DH calls once a fortnight, visits once a month. SIL is on the phone every day, round every weekend and usually during the week too. I’d have gotten more involved than I am if it hadn’t been so fraught, but I’m not entering into a turf war over looking after someone in their old age.
So I think there are only a few avenues open to you:
- Avoid SIL much as possible and go without the meals at MILs wtc. Mitigate this by inviting PILs round to yours on other special occasions and ask MIL to bring sides/dessert etc
- Offer to host some Xmas/Easter at your house and if SIL kicks off under your roof you stand up to her. You could and up looking like the bad guy here though.
- Enlist PIL in a coalition to change SIL’s behaviour. Even if they do join in with this, she’s an adult now and her behaviour patterns are formed. People can only normal change their own behaviour as adults with effort and sometimes professional hel, so this would be a challenging and probably fruitless road.
- Tough it out and don’t let it bother you. Easier said than done but possible if you think it’s worth it.