A Texas judge has decided an unusual child custody case involving a surrogate mother and the man she claims tricked her. The judge ruled that a woman who gave birth to twins using a donor egg is a mother to the children she carried. Had the judge ruled against the woman, there could have been implications for other women who give birth using donor eggs.The case arose in July when the 48-year-old woman gave birth to the twins. She was not biologically related to the children. Instead, a friend had paid for the woman's in vitro fertilization using a donor egg and his sperm. Although the two were not in a romantic relationship, the woman believed they would raise the children together. It was only when a social worker visited her in the hospital after the children were born that she first learned the man considered her to be a surrogate.