My grandmother did this in her will for an uncle of mine who was an alcholic. If I recall correctly he got the right to live in the house and right of ownership if he married, it not on his death it went to the other siblings.
I think a right of residence, and right to ownership on marriage and if no no marriage for it to go to his child on death.
I think ownership transferred to the other siblings is only going to cause trouble.
I hope someone is helping this man to deal with his problems.
Whatever is decided, it must be ensured that he can raise no loan/mortgage on the property.