Purchase agreement contract?

[Frankie Betancourt]

Hello, i am trying to buy a house from an elderly person but having alot of trouble he is not on the deed only hes mother and father names is on the deed but hes fathers and mother have not been living for 80 years me and the seller want to avoid going to probate court is there a way to do some type of purchase agreement and accept all responsibilities for the house paying taxes on it etc?