I'll try and be brief otherwise this post could be a book so apologies if I skip over details. In a nutshell, MIL is a narcissist and has been awful to DH his whole life and me nearly as long as we've been together (over 10 years). We've tried to deal with it and work through various things that have come up so we can still keep them as family but DH has finally started seeing through the FOG and I've started tackling my people pleasing and we're not happy putting up with it anymore. Trouble is we're lost how to deal with it.
We live away from them now so I have virtually no contact with them anyway apart from 'high days and holidays' like Xmas etc, because they show virtually no interest in me and DD, not because I've ever refused to speak to them, and DH keeps contact with his mum mainly by phone. He's said before he'd be prepared to cut them off completely if it seemed like the right thing but I know he'd be devastated and so guilty as he's still struggling with FOG, they're getting older now and he's talked before about how awful he'd feel if they died with there being bad blood, so I've always said I don't want him to do that unless he decides he wants to.
In the past there's been major incidents like MIL trying to ruin our wedding, screaming at me that I'm evil and causing countless arguments whenever she's felt like it but also much smaller nastiness too, it's simmered down now we're not around her much and now SIL has children for her to dote on but she's still spiteful to us.
Trouble is his mum is still wrecking DHs head via these calls but it's all very subtle, like telling him how well his sister is doing in things that she knows he's struggling with at that time. Eg, DH has depression so if he has a few weeks where he's not getting out much suddenly she'll be full of stories of lovely activities his sister has done with her family etc. Or she'll ask 'innocent' questions like when DH was made redundant it's all 'so they didn't have any other jobs they thought you could do? Don't they think you're very skilled then?'. Sounds petty but it's relentless and there's so many examples, it's like death by 1000 cuts. If she was challenged on it she'd feign ignorance that she was just trying to talk about family news etc.
The whole family are her flying monkeys, FIL is browbeaten and will agree to anything for a quiet life, DHs sister is desperate to stay the golden child and not get the narcissism directed at her, as all the spite is saved for DH they get quite a cushy life with the in laws doting on them so SIL will make the most ridiculous arguments/points to excuse whatever MIL has done.
Due to this we can't talk to MIL or lay down boundaries, it's like trying to stop someone hitting you when there's other people ready to hold you down so they can kick you instead. Because of them desperately trying to ignore MILs bad behaviour it's very difficult to make any sort of low contact environment, like if we say we're not going to visit them in their home (MIL is worst there) everyone acts as though we've gone nuts and are being completely unreasonable, if we then brought up why the boundary was there and what's happened in the past MIL gets very 'upset' and offended and everyone rallies round her and acts as if she'd never done anything wrong.
Is there any way of openly being low contact in this sort of gaslighting environment?