While unmarried, Alexandra had affairs with several men and eventually had a child, Marlena. One of the "boyfriends," Walter, was unaware of the affairs and believed Marlena, was his child. He voluntarily acknowledged paternity and loved and supported the child until she was ten years old. When Marlena needed a kidney transplant, Walter learned through tests that there was no way he could be her father, and that he was not a suitable donor. He now wants to disestablish paternity. How will the courts respond to his petition?