re: Parents considering Reverse Mortgage

This is confusing. OP says family is now running it, and he is the only family, so OP is running it?

Not averse to the reverse mortgage, but there’s a limit as to how much can be borrowed against the home. Seeing as the business sounds like it has been handed to the OP, couldn’t a loan be taken against a piece of the business to pay them for building it? Or possibly keep them as part owners and pay them an annual dividend?