The One and Only Family is the fourth and final book in Katherine Applegate's beloved One and Only series, following the Newbery Award-winning The One and Only Ivan, The One and Only Bob, and The One and Only Ruby. This instant #1 New York Times bestseller brings readers back to Ivan the silverback gorilla for one last adventure as he navigates the joys and challenges of parenthood.

Ivan has been happily living in a wildlife sanctuary with his friend Ruby next door in the elephant enclosure, frequent visits from his canine friend Bob, and his mate Kinyani by his side. When Ivan and Kinyani welcome a set of twins, Ivan must learn what it means to be a father while grappling with memories of his own childhood in the jungle and his own twin sister. The story explores themes of family, memory, hope, and the courage it takes to be honest with those you love.

This 272-page hardcover is published by HarperCollins and is recommended for middle-grade readers. In the tradition of timeless classics like Charlotte's Web and Stuart Little, Applegate crafts a poignant and heartwarming conclusion to the story of the world's favorite silverback gorilla.