The main point is I don't want anyone get in my house because many many violation.

And the probate process pays the final tax bill for the person and the person's estate prior to closing.A probate case is considered open until the final distribution is made.The main problem with buying a house for someone who inherited it and they did not do probate, or they started it--opened it--but did not like the oversight or process, then they just stop following the probate rules (sell stuff, pay bills, then distribute assets/money) and sell the assets as a real person and the money does not make it to the estate, then the sell may be considered fraudulent and reversed by the court overseeing the probate case. 

I just don't know realistically what the benefits would be on a relatively small portfolio or if my wife could manage it until it grows larger.2. 

@Bryan Johnson In the investing world there are 2 main types of loans: "Conventional, Conforming" and "Portfolio" loans.

I have narrowed my view to buy and hold mainly, for stability as well as less risk in starting, than some of the more fast paced options.

Tenant A has a family of 5 and rents the main part of the house.

One of the main reasons being is that I'm planning on financing through FHA / 3.5% down.

My wife of 39 years was born and raised in Maine and when she retires in several months, she'd like to move back. 

@Joseph Bryant As I have suggested with cluents and others, first remove the benefits of the tax policy.

The main reason being, they prefer to be where the action is, in urban areas close to the hottest juice bar or aqua-yoga studio.