The Family Book by Tod Parr

From chapters.ca:
There are so many different types of families, and The Family Book celebrates them all in a funny, silly, and reassuring way. Parr includes adopted families, step- families, one- parent families, and families with two parents of the same sex, as well as the traditional nuclear family. His quirky humour and bright, childlike illustrations will make children feel good about their families. Parents and teachers can use this book to encourage children to talk about their families and the different kinds of families that exist.