This is a tough question without more information.
If there is a written lease and the tenant is a family member, the lease may still control how you proceed with the eviction.
If there is no lease, then the tenant is "at-will" and can be evicted with sufficient notice in writing and an eviction or forcible entry and detainer lawsuit filed in your local Justice of the Peace court.
Either way, visit your local Justice of the Peace and ask them to guide you. They are generally courteous and will help you file the correct documents.
Good luck.
Mike Morris
Morris & Allen, pllc
New Braunfels, TX
