Children have no rights whatsoever to genetic ties with their parents. Otherwise, heterosexual relationships would be more important than homosexual ones, and such a notion is just obvious vile bigotry, of course. And yet parents have a right to genetic ties with their kids.
Why is this so? Why is it that adults have the right to be genetically linked to their kids, but not vice versa? Simple. Adults have money to buy manufactured children from the Reproduction Industry, but kids don't have money, and even if they did, one cannot buy a manufactured genetically linked parent.
"Marriage equality" is bullshit.