Can you help please

I was driving my kids to school today and on the way home decided to cruise up and down some streets,to see what I can find. Well, I found a couple fsbo's. I called on one and it turns out it is an estate sale. My question is,this house needs $25,000 in work from a brand new roof to updating inside(some mold growing because of bad roof). I asked the executor of the estate which is the oldest of 3 brothers how much they wanted. He told me $50,000. I said if I paid cash today what's the lowest you can go he said $45,000. By the amount of work needing to be done I think $35,000. The real estate analysis here said it's worth $113,000. Comps in area run the same. What can I do to close the deal? The brothers are looking to make something off this and I want it to be win/win for everyone. It's a 3/1, 1456 sqft, lot size is 11,000 sqft. They want it sold before winter because they have had it over a year now. Any advice would be greatly appreciated. I plan on a whole sale strategy