However, some states have laws that give the homeowner authority to terminate a lease in order to occupy the home.

@Scott Goulet Find out who is the authority in your area for septic.

Rather, it could be authorized to act on behalf of the property owner via a contract.

Check your lease regarding additional occupants, if it's over your head, talk to an attorney about it.The decision making authority regarding this Asset without an LLC operating agreement specifying it is probably Partnership law, whatever that means in your state laws.

Maybe speak with the local authorities to see if there is a way to transfer him to a facility that can care for him and provide the medical help he needs.

Department of real estate in almost all states is the authority over PMs as they need licensed so complaint to them to start .. then they get the proper criminal folks in the state involved.. thats what I have seen.If its smaller amounts then complaint to the DRE usually will rectify it as the PM does not want to lose their license and their lively hood..

You need to make sure the sellers have the right to actually sell it (so they currently hold clear and marketable title), and that they acknowledge getting the money they requested (so a purchase and sale agreement that then shows up on a HUD-1 closing statement according to the stipulations and agreements in that contract).If you want to learn more about private lending to work to attract private capital, I am one of the authors of BiggerPockets book on private lending which you can learn more about it here: https://store.biggerpockets.co...

I have local people helping, with rehab contractors, housing authority contacts, and local real estate agents, so this is not a total remote deal.  

Up to you if you want to do a new lease with two tentants or add him as an authorized occupant with an addendum. 

An easy way to accomplish this at your age other than building credit the slow and arduous way is becoming an authorized user on a family members credit card who has good credit.