(a) The mother-child relationship is established between a woman and a child by:
(1) the woman giving birth to the child;
(2) an adjudication of the woman's maternity; or
(3) the adoption of the child by the woman.
(b) The father-child relationship is established between a man and a child by:
(1) an unrebutted presumption of the man's paternity of the child under Section 160.204;
(2) an effective acknowledgment of paternity by the man under Subchapter D, unless the acknowledgment has been rescinded or successfully challenged;
(3) an adjudication of the man's paternity;
(4) the adoption of the child by the man; or
(5) the man's consenting to assisted reproduction by his wife under Subchapter H, which resulted in the birth of the child.
Official text of the Texas Family Code as published by the Texas Legislative Council.