It's tempting to ask whether these folks are part of the national conspiracy to make a ruckus over books like this (or this book). A local couple in Lexington, MA (where I live) took it eventually all the way to Federal court (where they lost).They were financially backed (and many people think put up to it) by an organization called variously Article 8, or Mass Resistance or maybe some other name that buses people in to protest having such books in school libraries. It brought us as a town to the attention of the Phelps folks, who came to do their virulent anti-gay protests in front of a couple of churches and the elementary school in question. argh.
It's not a particularly good book. If you're looking for a little kid picture book about same sex partners, I would go for something like "Mama Eat ant yuck"
https://id304.securedata.net/twolives.com/merchantmanager/product_info.php?products_id=24
or one of the books about lots of different kinds of families that happens to have same-sex parents included in the mix.