Legal Question in Family Law in Texas

It might be. If you are guests of his, you have do vacate. If you are tenants of his, then he may be able to evict depending on what you have done or haven't done and the terms of the lease.

If you are tenants without a lease, the law would hold that you have a month-to-month lease which can be terminated by either party upon notice. You can challenge the eviction. If he takes you to court, you can explain to the judge why it's improper for him to evict you.