Yes. Under Texas law, if a man was married to the mother when the child was born, or at any time during the 300 days before the child was born, he is presumed to be the child’s father.
A man will also be presumed to be a child’s father if he married the mother after the child was born and voluntarily claimed paternity of the child with the Vital Statistics Unit or, during the first two years of the child’s life, he continuously lived with the child and represented to others that the child was his own.