Since freedom of personal choice in matters of family life is a fundamental liberty interest protected by the U.S. Constitution, did the state court err by looking to the best interest of the child as the basis for granting nonparental custody when it is insufficient to overrule a parent's constitutionally-protected fundamental liberty interest?

Whether the state court erred by looking to the best interest of the child as the basis for granting nonparental custody when it is insufficient to overrule a parent's fundamental liberty interest