You cannot forced them to do the probate to get title transferred to them. Presumably if they wanted to sell they'd cooperate and get that done. So that suggests to me they may not be interested in that. If that's true then even if they transferred title you'd still have a problem because they'd not join in the sale. The usual solution to this problem is to file in court for a partition action. In a partition action, the court will either divide up the property among the owners (as in a large vacant tract of land) or, if that's not possible, order the property sold the proceeds divided among the owners. The problem is that partition sales usually result in low prices for the property and you have the expense of the partition action. I suggest you see a local real estate attorney familiar with partition actions for advice on what you'd likely get from that in your situation and what it will cost you.