This document is a book about the author's grandfather, nicknamed Opa. It summarizes that Opa immigrated to New Zealand from the Netherlands at age 35 with his wife to start a new life and learn a new language. Opa served in the Dutch army and fought in the Indonesian war at age 18, receiving a bronze cross for bravery. He had three children and was a beloved grandfather, great-grandfather, and Opa who loved nature, animals, and was a Jehovah's Witness.