You do understand that two people can not be married, and have kids together, right? Just because they're not married doesn't mean the mom or dad has no legal rights to the kid. The father is the father regardless of the relationship status of the parents and same for the mother.
Also, my dad wasn't poly, and he vacated my life all on his own.
So Israel is using the Nazi's definition of Semite. Pretty sure the logic to stop using that would be the same as the reason we stopped giving credence to the Nazi's definition of Aryan.