Saying some people have one mommy and one daddy and some people have two mommies and two daddies leaves out the idea that your child might be gay. Lots of people who are avid gay rights supporters don’t want to acknowledge this possibility.
I think you’re original explanation was better. Think of this, many religious groups think that being left-handed is bad because, who sits at the left hand of god, and at the right? Lucifer and Jesus, respectively. I know a man who is left-handed who, as a toddler, would have things smacked out of his left hand when he picked them up, and was not allowed to write or do anything with his left hand.
Needless to say his coordination is terrible, and his handwriting, imperceptible.
Also, this book is cute (though your son might be too old). It’s a true story about two male penguins in the New York zoo who paired together and who kept trying to hatch rocks, and so were finally given an orphaned egg.
There are also lots of other childrens books about gay issues, google it up.
Oh, and, “Good job,” as Hancock would say.