family life is one of the liberties protected by the Due Process Clause of the Fourteenth Amendment

…Several decisions of this Court make clear that freedom of personal choice in matters of marriage and family life is one of the liberties protected by the Due Process Clause of the Fourteenth Amendment. Loving v. Virginia, 388 U.S. 1, 12; Griswold v. Connecticut, supra; Pierce v. Society of Sisters, supra; Meyer v. Nebraska, supra. See also Prince v. Massachusetts, 321 U.S. 158, 166; Skinner v. Oklahoma, 316 U.S. 535, 541. As recently as last Term, in Eisenstadt v. Baird, 405 U.S. 438, 453, we recognized “the right of the individual, married or single, to be free from unwarranted governmental intrusion into matters so fundamentally affecting a person [410 U.S. 113, 170]….