My dad passed recently and I am allowing someone to live in the house rent free because I do not live in the same city and need someone to watch the house. They do have to pay for the bills though. We have a signed agreement that they pay for the bills and there are some rules that would cause their removal from the property (damage to property, theft, drugs present, etc) They and I have signed this. I would like to know if they are considered a tenant even though they do not pay rent or perform any services. Also, is this written agreement enforceable in Texas?