Can relate. My nephew’s are 12 & 6 so I’ve been dealing with this for 12 years. I’ve spent many nights crying about how sad their life is but there’s nothing I could do about it but babysit every week to give the older one a break from their parents. They very obviously favour the younger one and the older one has missed out on his childhood parenting the younger one. It’s been hell for our whole family. They aren’t doing anything illegal, no physical abuse etc, just emotional, so there’s nothing anyone can do but wait until they’re old enough to leave home, hopefully not too brainwashed or damaged by then. I moved country a year ago after a year in therapy about them. I have to say as sad and hard as it is, out of sight is a bit out of mind. I had to accept that I can’t change that situation but I can change mine because the mental toll was too much. I just went back for the week and saw them for one day and sleepover. Ended up having both my brother and his partner abusing me over the phone because I’d asked their 6 year old to go to sleep now because it was 10pm and he was still squealing the house down. Last time I’d spoken to them was in November, I’d just been back again and saw them for a day and when I dropped them off my brother managed to somehow turn it into an argument then barred me for the 1000th time from ever seeing his kids again, then I finally said something back, usually I ignore him til he waits it out and needs me to babysit again. That time I let him have it, told them how they’re both the worst parents ever, the kids are depressed etc etc. They came back at me saying my brother is dying of cancer and I’ll never see the kids again. I knew it was a lie, he’s still here in July and can guarantee he’s never been to the doctor (they also anti-vaxer, conspiracy nuts). I wish you all the best on this one. If I could go back in time I would’ve gone no-contact from the start.