I Have Series (I Have Two Dads and I Have Two Moms) by Colleen LeMaire
Plot Summary: Families come in all shapes and sizes. The I Have Series believes every "Once Upon A Time" deserves a "Happily Ever After", and I Have Two Dads shows the beautiful love a same-sex family has for each other.
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This series of 6 books includes all sorts of diverse families and was written to normalize diverse families.