Guess I just assumed most had to be done on site but those are awesome ideas I will be taking advantage of.

First, throw out the idea of comparing interest since the interest is applied differently...and not just because the loan is amortized over 30 years. 

I want to start out with a 4 unit building any suggestions or ideas on startup

Her idea is to fix it up and live in it ONLY.

They need to have a better idea what they want to do.

Any ideas? 

I figured it was a bad idea.

Would it be a good idea to vet a new Gc by getting estimates on rehabbing the third floor with carpet and mainly renovating the bathroom?

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.

Any better ideas?