Try to make me homeless. Go on. Give it your best shot.
Try to make your brother homeless. Your colleague. Your friend.
You'll find you don't have any power to make people homeless.
Try to make me want to die. Try to make anybody want to die. You'll find you don't have any power to do that.
If you made my kids distraught, do you think I'd be talking to you about it? Or just warning my kids of the dangers of you and keeping our distance from you?
His kids, his living circumstances, his mental health, they're all his responsibility. He's an adult. If things aren't making him happy, he needs to change them so that he feels better.
Why do you think he's the only adult who isn't responsible for his own wellbeing, and why are you the one who is responsible for him?
Leave him to his whinging. Let him send you 100 messages a day about how you've ruined his life, and see each one as further evidence that he doesn't have his shit together, and recognise that that's his issue, not yours. Also recognise that if you don't like his input into your life, that's your responsibility, and you're not taking it. Any fool can send us a million messages about anything they want. It's up to us to block them if we don't like it.