Cost my parents their house, and their marriage....

It's much harder to go back and finish a degree after life gets rolling, marriage, kids, bills, etc.

The weekend boarder babies are from the 68 yo womans son whose marriage is kaput.

They are like marriage -- easy to get into and hard to get out of.

Option 2:  You can front the money for a marriage councilor and sit to ensure there won't be any future snags! 

Usually a poor FICO score of one person in a marriage drags down the other person in the marriage, since when they are married one party can commit the other to a contract , even if the latter is unaware of the former's actions.

Business can be messier than marriage

Partnering is like marriage in a lot of ways. 

Creating a partnership is like a marriage.

., etc.   ...in general, these types of sacrifices tend to be easier when you're younger (especially before marriage/kids)  ...as the Great Warren Miller said about becoming a ski bum: "every year you wait to do it, you're just one year older when you finally do do it"  --the same thing applies to real estate; the sacrifices necessary for success often become harder to make the older you get... it's a whole lot easier to live in a house hack with 7 housemates when you're in your 20s than when you're in your 40s!...