Legal paternity is complex. It does not necessarily refer to the child's biological father. If the mother a child is married at the time of the child's birth, her husband is the child's legal father. If the mother is unmarried when her child is born, the biological father is not yet the child's legal father. In order to be established as the legal father in this case, parents must sign an Acknowledgement of Paternity form. Otherwise a paternity case must be filed. If the court signs an Order of Filiation following the paternity case, the legal father would now be entitled to all the rights and responsibilities to the child in question.