Sometimes we have more than one best friend, and that is okay! This is a great book if your little one is having a hard time with their friends having other friends, too.
This book is a huge hit in my first grade classroom. My students love the simplicity and charm of the two main characters, Piggie and Gerald. They love to read along with me through the word bubbles on each page. I believe that all Mo Willems books are wonderfully written and illustrated. This would be a great book to buy for a young child in your family. There are several books in the series, so you could easily grow the collection in no time!