First of all, I love my parents and we are all close as a family - I have two older sisters. But my parents' relationship has always been questionable and it's only getting worse and I'm really struggling to stay out of it, and of course every time I interfere, it just causes arguments.
Basically, my dad has always been this old school guy, woman's job is to cook/clean/look after kids, he provided for the family but my mum was never a SAHM, she worked on top of all that too. Dad's attitude to his health has always been ignorant, he smoked like a chimney for many years, unhealthy diet, no exercise. Now it's all catching up with him - his lungs are completely destroyed, he has an irreversible obstruction lung disease which means he can barely walk 100 metres without losing his breath, and every minor cold is potentially dangerous (ended up in hospital on breathing machines more than once). That already severely limits what he can do with his life and he has become very bitter and grumpy in result. Still not blaming his smoking and other life choices but just unhappy in general. On top of that, his terrible diet caused him a severe heart attack last year - helicopter transport involved, mum had to give him first aid, very stressful time, doctors said there is almost no chance to recover, and yet he miraculously did. But he is required to follow a diet and take it easy, and he does none of those things - washes down his blood sugar medicine with a glass of coke, eats all the cakes and sweets he can find, orders mum to cook him fried meaty food every day etc. Mum not only enables him but seems to encourage him, brings him all these things and buys it for him. Partly because she feels sorry for him, and partly because she wants to avoid the drama - his sulking and shouting and insults when he doesn't get his way. He has always been the sulky type but got a lot lot worse ever since his health issues got worse.
Now my mum is a lovely kind woman, she hates confrontation and arguments and want to make others happy and always puts herself last. She would never leave him - partly because after 40+ years together she can't even imagine any different, she doesn't have anywhere to go, divorce is still not a thing for their generation around my hometown, but partly because of course she knows he wouldn't survive for a week without her. He can't cook or take care of himself, he would just totally give up and she knows it. So she sacrifices her life to care for him. But rather than push him to look after his health, she basically supports him destroying his health even more. But his terrible health is destroying her too - every episode when he ends up in a hospital, she's a nervous wreck, doesn't eat or sleep for days. On top of that he makes her run around him as a servant in the house, but also do jobs around the garden and the (large) house that he used to do but now can't due to his health - but he wouldn't pay anyone to do those jobs (he's tight with money) and he wouldn't downsize so she's pushed to do all that otherwise here comes the sulking and shouting again. As a result, she's exhausted mentally and physically, she's aged so much in the last few years and I really worry about her, this will drive her to death. She also basically can't have a life, can't travel etc even if normally she would love to, but he can't and she won't leave him at home alone (partly due to worrying about him and partly due to his sulking). It breaks my heart.
I've tried talking to them both, arguing with them both, to no effect whatsoever. I'm only told to mind my own business (by dad) and to not make things worse (by mum).
I know I can't change what two adults do with their health, their relationship and their lives, but it still is so frustrating and painful to watch.
I don't even know what I'm asking. I suppose the similar stories of others and how you dealt with it? I already live quite far away which means seeing them once a month (and I will be moving abroad soon so even less frequently then) which I guess helps with the staying out of it part. But it still doesn't stop me worrying. Any experience and advice will be appreciated.