My boyfriend's dad passed away without a will. He left a house for the 2 children my girlfriend and her sister. Her sister moved out of the house soon after the father's passing away and found a lawyer to take care of the probate and assigned her self as the probate administrator. I moved in with my girlfriend and we did some remodeling of the flooring, fixing of some plumbing problem, bee issue at our own costs. Now the probate(house) is going for sale but her sister is not willing to reimburse us the cost of remodeling and other repair costs. She said the remodeling is done at our own intend (she didn't disagree when we did it). She will only be willing to reimburse the repair cost that will incurred after the house is being put up on the market. What can we do to get our money back?