I don't see how this is harsh. You are the one working while he lives for free not just off you but also off your mother. It must be nice! Honestly I am a tolerant person but no way I'd allow this. If he is too sick to work then he might apply for disability and contribute that way. If not he is on his own.

He doesn't work because he is allowed to. You and your mother are saints allowing him to live for free. He knows well that if two of you stop supporting him he would need to change his ways. Is he but supporting his child either?

Don't get married. You'll end up paying spousal support too.

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