Earn enough to leave W2 job, provide supplemental income while retired, having RE investment fund your retirements etc The ways to earn and learn seem endless.

I deal with the sheriffs auctions, tax liens, I have endless contacts.

There are endless ways.

Yes they are supposed have endless hot water but they can only heat it so fast and a smaller unit will not keep up with a shower and the clothes or dish washer.One of the biggest problems for tankless water heaters is improper installation especially for natural gas versions.

Why would you sell it for a loss, then buy something else for another loss plus more losses for endless repairs on the next crap car?

After many trials and endless searches, I found one that worked and worked GREAT.

You could buy it together and then quit claim it to an LLC, but there are risks to that strategy as well- endless threads here on the forum about that, so I won't belabor the point. 

They paid good money for a nice house in a nice neighborhood and probably just don't want this AirBnB thing bringing endlessly different people into the neighborhood.I'll bet they end up continuing their efforts to be a PITA until you give up and sell.Not everyone wants to live across the street from motel when they've paid a big pile of money for nicer house in a nicer neighborhood.

I would consider building it for you, but to avoid endless hours of revisions, I need fairly specific blueprints of exactly what you want.

High inflation, increased money supplies and endless social assistance programs aren’t going to make investors feel any warmer inside.