DH has always had a difficult relationship with his mother (he's not the only one, she has a history of falling out with family members and not speaking to them for years.) He feels she never loved him, preferred his sibling (who died in adulthood) and I've witnessed her undermine and put him down throughout the time I've known him. Nothing he ever does is good enough. She says hurtful things. She claims his skills and successes as her own, and also rewrites history, painting herself in a better light. Everything is about her - from FIL's illness to the death of SIL (no one else was allowed to grieve, no one else could possibly understand the loss, even SIL's husband). DH has had a lifetime of placating her: his one attempt to stand up to her in his late teens resulted in him moving out and her not speaking to him for months until he apologised. That incident has since been rewritten as unreasonable teen behaviour, with key facts being changed when cast up to him.
A while ago, I revised my opinion from thinking she was the most selfish parent I'd ever encountered to thinking she was probably a narcissist. Not that a label changes anything.
We live over 2 hours away and see ILs every two-three months (we always have to travel to visit them, they never come to us even for DC's birthdays.) They have never babysat and only see DC when we bring them to visit. DH phones dutifully every week (they never call us). I can cope with this level of contact, but every so often an especially bad phone call is making DH angry, hurt, upset and sending him into a black hole of depression. He believes his mother wishes he had died instead of his sister, though it don't think she has ever actually said this, I am really worried about what it's doing to him, especially as FIL is not in good health, and we're thinking ahead to when he's no longer around and MIL needs more practical support (she is quite a bit younger than FIL, they live rurally and she doesn't drive). When we have discussed it, DH says he isn't willing to cut off contact, given she will be more and more reliant on us, but I dearly wish I could minimise the damage to his mental health. Has anyone successfully supported a partner in this position? Is it even possible to manage this kind of relationship without psychological damage? We're not in a position to pay for a therapist.
Thanks in advance.