My girlfriend just had our baby and I just want to know that it is truly mine for peace of mind.

 The baby was born last week. How do I go about getting a paternity test and what is the cost? Also how do they perform test?

My father is in prison in Texas and a few years ago he told me he had another child before me (a daughter) and she doesn’t know about him.

I contacted her mother and she is not sure that my dad is the true father. I think my dad will be willing to cooperate. So how would I get a paternity test done?

Remember this is all in Texas and I thank you for any helpful information.