Previous Durable Power of Attorney Continues in Effect Until Revoked
General Provisions Regarding Durable Powers of Attorney · Duration of Durable Power of Attorney and Agent's Authority
The execution of a durable power of attorney does not revoke a durable power of attorney previously executed by the principal unless the subsequent power of attorney provides that the previous power of attorney is revoked or that all other durable powers of attorney are revoked.
Official text of the Texas Estates Code as published by the Texas Legislative Council.