Tex. Estates Code § 1021.001

(a) For purposes of this code, in a county in which there is no statutory probate court or county court at law exercising original probate jurisdiction, a matter related to a guardianship proceeding includes:

(1) the granting of letters of guardianship;

(2) the settling of an account of a guardian and all other matters relating to the settlement, partition, or distribution of a ward's estate;

(3) a claim brought by or against a guardianship estate;

(4) an action for trial of title to real property that is guardianship estate property, including the enforcement of a lien against the property;

(5) an action for trial of the right of property that is guardianship estate property;

(6) after a guardianship of the estate of a ward is required to be settled as provided by Section 1204.001:

(A) an action brought by or on behalf of the former ward against a former guardian of the ward for alleged misconduct arising from the performance of the person's duties as guardian;

(B) an action calling on the surety of a guardian or former guardian to perform in place of the guardian or former guardian, which may include the award of a judgment against the guardian or former guardian in favor of the surety;

(C) an action against a former guardian of the former ward that is brought by a surety that is called on to perform in place of the former guardian;

(D) a claim for the payment of compensation, expenses, and court costs, and any other matter authorized under Chapter 1155; and

(E) a matter related to an authorization made or duty performed by a guardian under Chapter 1204; and

(7) the appointment of a trustee for a trust created under Section 1301.053 or 1301.054, the settling of an account of the trustee, and all other matters relating to the trust.

(a-1) For purposes of this code, in a county in which there is no statutory probate court, but in which there is a county court at law exercising original probate jurisdiction, a matter related to a guardianship proceeding includes:

(1) all matters and actions described in Subsection (a);

(2) the interpretation and administration of a testamentary trust in which a ward is an income or remainder beneficiary; and

(3) the interpretation and administration of an inter vivos trust in which a ward is an income or remainder beneficiary.

(b) For purposes of this code, in a county in which there is a statutory probate court, a matter related to a guardianship proceeding includes:

(1) all matters and actions described in Subsections (a) and (a-1);

(2) a suit, action, or application filed against or on behalf of a guardianship or a trustee of a trust created under Section 1301.053 or 1301.054; and

(3) a cause of action in which a guardian in a guardianship pending in the statutory probate court is a party.