Home warranties tend to cover the bare minimum required to repair  items that break.

Their flat rate monthly service covers all materials and labor, wear and tear, tenant turnovers, repairs and replacement, preventative and comprehensive maintenance and home improvements,  Unlike home warranties, they don't charge any deductibles for repairs.Maintenance requests are reported by the tenant using their mobile video app or detected by IoT sensors from connected devices, and sent to the landlord or property manager for approval.

write something up with your attorney to cover your behind.

By modeling each lease, you'll be able to paint a clear picture of the risk/return profile of the investment.

Most just look at the pictures, the rental amount, and click the button looking for more info.

Doesn't have pictures of the unfinished basement but you could finish the basement and have a small second unit: https://www.edinarealty.com/homes-for-sale/915-highview-loop-se-pine-city-mn-55063-5012713#/

I appreciate your vision and  risk considering the picture 

Also Brandon Turners book, the Book on Real Estate Investing, has so much information that covers many various ways one can take, or how to combo investing opportunities.

They'll have so much more knowledge about houses, a lot less drama.... the other girl is brand new, and would likely struggle with bills, and may move for a better paying job-- whereas grandma has other people to help cover the bills...  

See if insurance will cover any of the costs.2.