I’ll go with Flu’s mortgage thru Bank of Parent idea.
Daughter lives in a better place cheaper, Dad keeps interest, daughter get’s equity upside. Equity downside, daughter get’s Dad showing the landlord ropes when they turn it into a rental.
Don’t quote me, but I think you could structure the mortgage through an LLC, bundle the payments to you as either retained earnings or dividends and then write off of taxes two trips a year to ‘check’ on your investment target market.
Not sure how many wins that is for you and daughter’s family but it looks like a lot.