Yes, the house needs to go through probate, or to be more precise, your mom's 1/2 interest in it needs to. This can be done quickly and easily and it will not prevent you from doing what you wish. You would buy out your father's 1/2 with the new mortgage. Do you have any siblings? If so, they would also need to be taken care of. This should not be a horribly difficult or expensive process.
Answered on Nov 22nd, 2012 at 2:52 PM