Yes. The Texas Property Code § 92.156 requires that a landlord rekey the locks no later than the seventh day after each tenant turnover date. “Tenant turnover date” is defined as the date a tenant moves into a dwelling under a lease after all previous occupants have moved out. The definition applies even if the previous occupants were the original owners of the dwelling. This means that your client, as the last occupant of the property, would have to rekey the locks no later than the seventh day after a new tenant moves into the home.