One Family by George Shannon
Plot Summary: Just how many things can "one" be? One box of crayons. One batch of cookies. One world. One family. From veteran picture book author George Shannon and up-and-coming artist Blanca Gomez comes a playful, interactive book that shows how a family can be big or small and comprised of people of a range of genders and races.
Youtube link: https://www.youtube.com/watch?v=_DoMh22rPIQ
This book uses a slightly confusing numbering system to say that a family can look like any number of people, any genders, and any number of ages.