In New York, and in the absence of abandonment, it is generally necessary to obtain the consent of the other parent to adopt a child.  DRL section 111(2)(a); Caball v. Mohammad, 441 U.S. 380 (1979.)  The United States Supreme Court held that a statute denying all unwed fathers the right to veto adoption, while granting that right to unwed mothers, violated the Equal Protection Clause.