How do i make a special offer to buy, sort of like a buy option ?

[Lucky B.]

There is a house in my sub division that i would like to buy. The husband recently passed away, and the wife was just a homemaker , and didn't handle the finances in the household . She is now left with 2 mortgages, one for the primary that she is in currently, and the rental house that is 2 doors away from me .  i know her, and i knew her husband very well. 

The house is worth about 180k. There is a existing mortgage on it for 110k . I want to buy it however i already have 3 mortgages and i know i can't get an additional mortgage. A friend of mine said i could get her to sign a buy option or future contract where i will get to buy the house if i could pay her 20 or 30 thousand now, she might sell to me and i can takeover the mortgages payments if allowed by her bank.   

Can you guys share your suggestion on the best strategy to get her to sell me the house, without me having to apply for a mortgage.