You probably cannot force him to return the share of the home that you gave him. But you could do a partition lawsuit to force the sale of the home without his consent and try to argue to the court that his interest in the home is really next to nothing because he was only added to try to get you qualified for a loan. But you run the risk that the court will say he should get half the proceeds. You really ought to see a real estate attorney in your state to review your options.