The next leap logically, to meet both dictates is "Susie has two mommies and one daddy" or "Susie has two daddies and one mommie".
It's Alice and Wonderland logic. Start with an insane premise and you come to insane conclusions.
How long before human to animal wedlock? New childrens book may be titled: “Susie’s dad is a dog?” Or “Jimmy’s Mom is a cow”. Polygamy is based on Religion and so will never be popular-in our neo-pagan world. How long before it will be illegal to be a Christian? How long before Satan is openly worshipped and out God-President is worshipped as a God like Caesars of old?
There was a recent article on a man who joined up with two lesbians. They each have a baby with him, he pays toward the household bills and helps with the kids, and the women can have sex with him or each other.
And they sold it as so great, the kids have both another mom AND a dad.