Hello,
it sound like he is punishing the family. Could it be? I know a person who attempeted suicide, and hospitalization was of great help, especially as separation from the same old habits, places and people. I know this sounds cruel, but maybe separate you son from you and otehr familiy nenbers may help. He may be left no one to punish, suicide may lose its allure.

Please, I'm tossing my opinion in the awareness that it may be a pile of stupid and dangerous crap. Just submitted to your careful evaluation (and the doctors' too, obviously).

Good luck