The Texas Department of Family and Protective Services publishes information about leaving a child home alone. They state the following:
Texas law doesn't say what age is old enough for a child to stay at home alone. However, adequate supervision is critical to keeping kids safe. An adult caregiver is accountable for the child's care and inadequate supervision can be a type of neglect (neglectful supervision).
The Texas Penal Code also makes it a criminal offense to leave a child alone in a vehicle under certain circumstances. Click here to review section 22.10 of the Texas Penal Code.