Brother and sister who have 4 children together...
Proponents of marriage (the traditional sexual union of a man and a woman) have for years said that redefining the institution to meet one sexual activist's predilection will by force of "equal treatment" clauses force open the possibilities of other unions.
Homosexuals argue that it is absurd to argue such a thing.
But leading academics, intellectuals, and university professors are using the exact same arguments to now argue for allowing other previously banned "marriage relationships" to go forward.