My dsis and her husband adopted my then 5 and 7yo nephew's 11 years ago. They've had a lot of ups and downs over the years battling for diagnoses etc, but unfortunately dsis's husband is also an alcoholic who hasn't been around over the past few years much. He's been in and out of their lives, and it's my belief dsis got along much better with my nephews when he wasn't around. Sure, it was hard for her effectively being a single mum, but you could see their bond developing.
Anyway, her husband is back on the scene and moved back in a few months ago. He's been sober for the best past of a year, but all hell has broken loose.
Eldest nephew turned 18 recently. He has PDA and ADHD and a phone addiction which means that he is often so tired he cannot function well. It got to the stage where dsis asked him to leave and she's paid £4k to put him up in a bedsit. I don't really want to get into the details, but suffice to say that I've no doubt my nephew's conditions have been really hard to deal with, but I'm almost certain that dsis's husband being back on the scene has massively unsettled the dynamics and she's ultimately chosen her husband over her son.
As a family, me and dh and our two dc want a relationship with our nephew who remains in contact with us. Dh called him earlier and invited him over for Sunday lunch with us next week. I feel so, so sorry that it's ended like this, my nephew is very vulnerable and really only about 14 in his abilities and I don't want him to feel he's been totally abandoned. It's really got me thinking about all the dynamics involved (including attachment issues, mental health problems, addiction etc) that have played a role in it reaching this point. He doesn't want my dsis to know he's in touch with us, but I don't want to keep it a secret from her either. Likewise I dont want to break his confidence of we're the only ones he feels able to communicate with.
I suppose I wanted a range of views on whether their relationship is salvageable, and whether there's any advice on what I should do. Turning our back on this poor lad isn't an option, and it's clear his neurodivergence and mental health problems make him particularly vulnerable. He's currently holding down a job, is getting PIP and is trying to make a go of things. But he doesn't have the planning and organisational skills necessary to properly function and he's resisting help from the authorities and dsis, and he's extremely demand avoidant. I'm not sure what will become of him, and it breaks my heart.