Sorry for the slow response had a wedding to prepare for at my house and just in recovery after being in the hospital.

As I'm sure everyone knows, the housing market is pretty locked up right now.

My interests especially lie with multifamily properties, house hacking, and fix & flips.

Only in this house your mom happens to be the tenant. 

When I tried to get it when my side of the family found out and tried ti take over reverser mortgage payments to bank because she had died it was to late so they sold the house to Hud and then other reverse mortgage companies but a relative still lives there so they can't kick them out.

Consider starting small with house hacking a duplex or triplex, and use tools like the BiggerPockets Rental Property Calculator to analyze deals.Good luck!

And, we'll probably want to buy another house before then. 

He is unlikely to fight back in court when everyone in the house is against him.When he is served notice, ensure everyone is in the home to witness it and present a unified front.

If I were in your and/or your mother-in-laws shoes, I would go to a local bank and use the free and clear house to secure a $150K+ line of credit. 

 Hi Roger, yes, the plan is to house hack.