The only reason I am considering it is because my sister just moved as well and my parents are only home in the summer, so I really do need to have an emergency person who will be here. 

A few months later my wife's mother and sister moved in with us. 

The section 8 website defines a family member as (father, mother, brother, sister, grandparents).

I do not know why when my sister, father and I show no interest in living or moving back to our hometown.

The idea in mind:Saving 100k in the next few years while living at home, paying off their mortage, leaving retirement a better possibilty for them as well as mentally relieving them from some of lifes stresses, and then ofcourse when they pass Ill get a higher percentage on the will and gain the appreciation.100k ÷ 170k .. is around 59% Id recieve of the final selling price.. ( The house has been valued at 500k)And then the 70k would be split 50/50 between my sister and I.

My sister has severe diabetes and can't drive anymore.

Not sure if you're still working on this, but Todd Bukaty with nbkc bank in Kansas City (if you google "Todd Bukaty nbkc" he's the first thing to pop up) was able to help my sister with a refi on their rental property in ATL, and they have very low income.

Hello - I am based in CA and my parents and sisters live in Houston.

For example for my sister in law we charge a 10 percent monthly fee for a 4plex, no leaseup fees even though the renter gets charged a 200 admin fee so we are making 360 a month.

I bought out my sister's appraisal company in 2016 after working for her for 7 years.