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You will have to do some kind of probate. In Texas there are a variety of ways to do this depending on your specific facts ranging from an informal type to a full blown probate. You can sit down with a local lawyer and they will go over the details of the estate so that you can determine which one is correct for your mother's estate.
You will want a lawyer that does probate law. You can find one at www.lawyers.com and enter Probate Law in the area of practice. That website also allows you to search by geographic location.
The reason that you have to do a probate is that the instant of your mother's death, there was created a legal entity called "the estate" and all of the property that she owned which did not pass by way of a beneficiary designation or something similar.
The probate court will need to look at the will to make sure it meets the requirements of a Texas will, if it was drafted by a lawyer it almost certainly will, as well as appointing an executor, if that is the type of probate needed.
Regardless, at some point the judge will enter an order that passes the title of the property to you and if it is a formal probate then the executor, who may be you as well, can sign a deed in that position/role transferring the property to you.
As far as cost, that varies tremendously depending on the size of the estate, the amount of work required, if anybody contests it, etc. In Dallas, probably $2500 on the low end if any kind of a hearing is needed. There really is no upper end because that all depends on if anybody contests it.
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