But how is that kid going to seek the way of God if Catholics shun him for the sins of his whatever-you’d-call-'ems? (The two guys claiming to be his dad, who, despite the dysfunction, he probably loves very much?)
Understand that I’m not suggesting for a second that the kids at the school be taught that that is a marriage, or that the parents be given communion at school Masses, or anything except that the right thing to do is treat other people with kindness and respect.
The closest equivalent to this that I can think of is single-parent families in the '40s and '50s. Dad went to parochial school back then. There were two kids whose parents were divorced who went there. The other kids all refused to play with them (or were told not to by their parents) because their parents were divorced, which Everyone Knew (back then) was Always Unacceptable. Again, never mind that while the parents may or may not have behaved badly (I haven’t a clue what led to the divorces), the kids were the innocent parties and should have been treated as such. Instead, they had no friends or support systems during what must have been a terribly sad and frightening time in their lives. How is that upholding the institution of marriage? Similarly, how is shunning and generally treating badly the child of two homosexuals leading anyone to God or upholding the institution of marriage?