Want to help.

[Cazastrophe]

My SIL has a serious pb with her teenage son aged 17 and I’d love to be able to help. Anyone in similar situation able to help?
So, teen has severe depression, OCD and is obese.
He saw his Dad beat his Mum when he was v young and we had to see psychologist but wouldn’t talk about it. He then 3 yrs ago, got a sickness bug which his bro and my SIL caught and was so ill, it scared him. Since, he developed severe ocd and can’t stop washing and thinks bugs are everywhere.
My SIL has taken him to docs and CAMS but he won’t discuss his pb and my SIL doesn’t know what to do any more. He was also diagnosed with severe depression and started waking up in middle of night to eat everything (bread, cereal...). He’s always been big but is now morbidly obese and over 20 stone and 6’ tall. He failed his GCSES then started college but wouldn’t try and got thrown off the course. He says he wants to die and has attempted suicide twice (more cries for help as he made himself sick) and was admitted to hospital but allowed home.
My SIL thinks now, he should be sectioned as upsetting as that is as his illness is impacting on her other younger son who he bullies and upsets constantly because he’s jealous of him for being ‘normal’.
My SIL took his phone and iPad off him when he bullied his younger brother but he threatened to kill himself. He does play on his illness to hurt my SIL.
My brother is not allowed to see the kids as he’s a dangerous man and hasn’t been part of their lives.

Any suggestions?

I'm saying this genuinely but what suggestions are you looking for? Therapy won't work if he doesn't want help or to talk about it. You can't have him sectioned for OCD (unless he's a serious risk to his own or others lives).

You could ask him what support he wants from you. Make sure he knows he loved. Take your SIL out for breaks sometimes?

Maybe suggestions was the wrong word but wondering if anyone has experienced similar and can share their experiences and if anything worked. He knows he’s loved but says it’s not enough. He wants to die basically but isn’t and I use his words ‘brave enough’ to kill himself. He said he wants to get run over, shot etc and die. His GP has said there is no help unless he talks so just at a complete loss hence reaching out to mumsnet in desperation. I can’t take my SIL out as I’m physically disabled and mostly confined to home. She comes round for a cuppa but given my own issues, doesn’t want to very often as feels she burdens me.

If she doesn't burden you then tell her again that you want her to visit more. If she does remember you're important too and allow yourself some space from it