My mother in law passed away and left house to us, what do we do?

In Texas there is a simple form of probate where the will is admitted as a Muniment of Title only. If that was the form of probate, then the order proving up the will is sufficient to transfer title to the beneficiaries - there is no other document necessary. If there was an administration where an executor was appointed, it was that executor's duty to transfer the house into the beneficiaries name(s) by recording a deed of some kind. If this was not done, you may need to contact an attorney to get the court to order the administrator to do his job.