Go to your county clerk (the probate clerk) and ask for the records on your mother's will. If it's probated, you'll be able to find it. If it's not probated, file an action to require the custodian of the will (I assume the executor) to probate the will.
If the will has been probated and the executor is just dragging his feet, you can file an action to require the executor to get on with things.
However, you should keep in mind a few facts:
(1) The executor is still under the 2 year limit;
(2) Depending on who the executor is, he may have some rights. For instance, if the co-executor was your mother's husband, and the home was community property (Texas is a community property state), he would probably have a "homestead" or "life estate" in the home. In somewhat simple terms, that would mean that it's his right to possess and use the home as long as he wants. An attorney would be able to help you determine if that is the situation.
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