My parents are considering selling their home of 35 years which they only have 70k remaining on their mortgage.

(Owner got it from his parents for $1, so has nothing is owned on it.)

I live with my parents right now so I don't need to house hack, if I get a duplex it's getting rented out completely. 

I may need a cosigner but my parents don't think I am ready to househack.

Their parents can pay for their room and board.

If you or your parents are a veteran then you should reach out to them.

We don't want to field zillions of after hours emergency calls for locked out roommates and their parents in the middle of the night, when there's nothing we can do save for drilling a lock or breaking a door (which would then need to be secured). 

Regardless, compounding is very powerful, and the more time you have the more powerful it is.When I was a child I read somewhere that one should try this: ask your parents to lower your allowance to 1 cent with the agreement that they will double your allowance each week: 2 cents the second week, 4 cents the third, etc.

College students and their parents were constantly visiting the area.2) There are two major hospital systems within a 10-mile radius.

Even if they only clean when you are coming thru, that is better than years of piling up.5) Gives you information to determine if you want to renew the lease.6) If you have regular inspections, then if a tenant is withholding rent, it gives you the opportunity to check on your property.Older homes with radiators and no fans in the bathroom are a nightmare.