Estate left to 4 children of deceased. Two of which are living in the house. Both keep saying they are going to buy the house. It has been 18 months, neither has. Oldest now won't let youngest buy it because he says it's his house due to oldest. How can my sister and I get them out of the house to prepare it to sell. house has been deeded to all four of us. Oldest won't even let my sister and I in the house. Keeps changing locks, etc.