This is a very general book, which allows the reader to adapt it to the child's specific situation. For that same reason, you'll definitely want to preview it before reading it to a child because there are allusions, both in text and illustration, to some potential triggers. The advisory at the beginning encourages the reader to change the text as needed, but you'll want to be very aware of the illustrations too. 
 That said, I think it's a good read about the many different make-ups of families and how they're all ok and it's all "normal." The beginning simply addresses change, and that all families change when people move, grow up, get married, join the army, and so on. The author talks about the confusing feelings around change, and how some changes can even be happy and sad at the same time. At about the midway point we begin to hear about birth parents, foster parents, kinship care and adoptive families. Again, previewing will help tailor this to the specific child. 
 I think it's very important for a child to see themselves reflected on the page, and that books are a good way to help them make sense of their world. This is a good title for that, and I appreciate the diversity shown in the illustrations. It's a pretty heavy-handed book though, and I wish there had been a silly moment of some kind to help the readers crack a smile. For younger readers and/or a lighthearted message about different family types, I'd highly recommend The Family Book.