Robbie (Don Grady) marries his classmate/girlfriend, Katie Miller (Tina Cole).

Also, the last 1 1/2 years of the series features fewer appearances of both Don Grady and Stanley Livingston.

Don Grady appeared in "The Christine Elliot Story" (1960).

Michael Crawford, the former Phantom of the Opera, stars and sings music written by Don Grady (Robbie from the 1960's television show "My Three Sons").

Don Louis Agrati (June 8, 1944- June 27, 2012), better known as Don Grady, was an American actor, composer, and musician.

Don Grady, as Joey Carter (1964) and as Hank Nelby in "Once a Clown" (1965 series finale)

Don Grady (Herman as a Boy)

He lost re-election as president in 1994 after Mayor Debbie Jaramillo appointed a controversial black police chief Don Grady.

Don Grady, 68, American actor (My Three Sons, The Mickey Mouse Club), cancer.

Her costars in the episode were Angela Lansbury, Martin Balsam, Roy Thinnes, and Don Grady.