I found this book at my local library. What to Do When It's Not Fair: A kid's guide to handling envy and jealousy is by Jacqueline B. Tone PhD, and Claire A. B .Freeland PhD, and illustrated by David Thompson. I'd recommend this book for ages 6-10. This book covers two topics: envy and jealousy. It relates these concepts to a pirate's life, which is fun and relatable for the age group intended. Every chapter has activities to help the child learn the concepts and conquer any troubles they may be having with these two emotions. It's also written so that a caring adult (therapist, parent, caregiver, or teacher) can oversee what the child is learning.
Some reasons why a child may be having trouble with envy and jealousy: sibling rivalry, perceived unfairness among peers, and favoritism. They may crave the attention of parents, teachers, and peers. They may feel left out. There are so many reasons.
From the therapist's perspective, the activities in this book have a "CBT" and "Mindfulness" feel to them, which is great, it helps the child to challenge their thoughts and to create more helpful, realistic thoughts, as well as develop a more accurate idea of other-awareness along with gratitude. I recommend this book.