Don Agrati, later known as Don Grady, was born in the vibrant city of San Diego, California. In 1955, he joined an elite group of 23 Mouseketeers when the iconic show first debuted. A decade later, in 1960, Grady embarked on a new adventure by joining the cast of "My Three Sons," which premiered in the same year and went on to run for an impressive 12 years, comprising 356 episodes.
Following the conclusion of "My Three Sons," Grady's passion for music drove him to pursue a career as a composer and songwriter. One of his notable creations was the theme song for the popular talk show "Donahue," which aired in 1967. Throughout his illustrious career, Grady made numerous guest appearances on various television shows, yet he remains most beloved as Robbie Douglas, the eldest son from the beloved sitcom "My Three Sons."