Did you know that squatters have rights? It's true. Even though your mother is obviously the owner of the property, with or without a deed which has been recorded at the court house, she has been in possession of the property for longer than is required to legally claim the property as her own. Look up squatters rights in the state where you reside. Then contact an attorney to get things recorded correctly. Who has been paying taxes on the property all this time? The law is that of "adverse possession". And in Texas the period is three years. Contact a lawyer because there are many ifs and buts and it's pretty much case by case basis when it comes to adverse possession.