As a parent, you have control over your children until they are 18 years of age. At the age of 18, they become an adult.
However, prior to the age of 18, a child can be or may be emancipated, or declared an adult in the eyes of the state of Texas. To declare emancipation, the child must have a full time job, be capable of supporting his/herself, and prove to a court that he/she does not need parental supervision any longer. This is a difficult burden for a teenager to overcome.