Heather has Two Mommies by Leslea Newman
Plot Summary: Heather’s favorite number is two. She has two arms, two legs, and two pets. And she also has two mommies. When Heather goes to school for the first time, someone asks her about her daddy, but Heather doesn’t have a daddy. Then something interesting happens. When Heather and her classmates all draw pictures of their families, not one drawing is the same. It doesn’t matter who makes up a family, the teacher says, because “the most important thing about a family is that all the people in it love one another.”
Youtube link: https://www.youtube.com/watch?v=jHPELRbTINk
This is a story about a little girl who has two mommies and a very smart teacher who points out that everyone’s family is a little different and a lot special to defuse any potential rejection or teasing.