Can he be held liable?

How can he sit in a line with me for 3 hours at a outdoor dog clinic with hundreds of pitbulls running back and forth around him and not bark once or lunge at them?  

So i live in Lawrence County Alabama.. my dad couldn’t afford to pay to taxes on my grandmothers property for 2017 (she’s deceased, but his property) anyway.. he’s been in and out of hospital withh cancer can’t work (self employed, no health insurance) and i couldn’t pay it either... so scrimping and saving to get t back.. mean while the man that bought it in January-March at the sale has cleared off a lot of my dads personal property and been in the house which still holds all of my grandmothers personal items/furniture/pictures/ antiques etc... and is planning to have it logged off....can he do that ??? 

Can he write off mortg interest?

Can he borrow against another asset?

How many payments can he miss before you start foreclosure?

A year upfront is tempting but how much damage can he do to the house?

What about the neighbor, can he sue me to pay for his fumigation.

how can he refuse? 

Can he simply transfer the title/deed in our name if we were to do seller financing and pay him amortized over 15 years?