No clear cut determination on that issue, otherwise child custody cases wouldn't be so contentious, even when only two parents are involved.
However, the U.S. Constitution was drafted to set up a government, not provide a Talmudic reference book for figuring out the solution to all of life's everyday problems.
The Tenth Amendment was added to the Bill of Rights (for some reason, law schools stop teaching the Bill of Rights at the Eighth Amendment) to ensure that the federal government would not get involved in areas where the Constitution was silent. Those powers were properly reserved to the several states or to the people, so that, for instance, you wouldn't get the federal government entangled in how one disposes of his property in a will, or who gets custody of the kids should a couple break up.
But, with the latest rumblings from Mount Scotus, perhaps it's time to bring back the Delphic Oracle, to be consulted in figuring out all of life's thorny issues. Certainly, the reasoning used by Justice Kennedy is better suited for printing in Cosmopolitan Magazine or Seventeen, than U.S. Reports.