Don Agrati (born June 8, 1944 in San Francisco, California), better known as Don Grady, is an American composer, musician and actor. He is remembered both as one of Mickey Mouse's Mouseketeers, and as Robbie Douglas, from "My Three Sons". His sister was also an actress, billed as Lani O'Grady. Their mother was a talent agent, known as Mary Grady. Wikipedia
The definitive Wikipedia entry for Don Grady. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Don_Grady