The Cassidy Brothers on Good Morning America Monday!

David, Patrick and Shaun Cassidy will be live on “GMA” Monday, July 20, to give viewers a sneak peek at their new show.

Photo circa 1970, left, showing members of the television series "The Partridge Family." David Cassidy, left, and Patrick Cassidy from the ABC series "Ruby & the Rockits."

David Cassidy of “Partridge Family” fame and his half-brother Patrick star in ABC Family’s new comedy, “Ruby & The Rockits,” about two brothers who used to be pop stars. Shaun Cassidy developed the show for his real-life brothers and is the executive producer.

The plot: In the 1980s, David and Patrick’s band, the Rockits, was at the top of the charts, until they broke up. Twenty years later, Patrick is settled in suburbia with his wife and two teenage sons while his brother is still on the road.

So who’s your favorite Cassidy brother? And what are your favorite moments from “The Partridge Family”? We want to hear from you — share your favorite memories with “GMA.”

Please share your thoughts by filling out the form below. An excerpt from your response may be used in a future ABC News story, or an ABC News producer may contact you for more information.