Mini 'Partridge' Reunion on "Ruby & The Rockits!"

It's a mini-"Partridge Family" reunion when Shirley Jones once again plays real-life stepson David Cassidy's TV mom when she guest stars on "Ruby and the Rockits."

In the "50 Ways to Heave Your Mother" episode of the ABC Family show, Shirley guest stars as David and Patrick Cassidy's mother -- Patrick is her biological son – when she visits the boys and meets David's long-lost daughter for the first time. She insists that Ruby (Alexa Vega) call her Mrs. Gallagher instead of Grandma -- even as Ruby valiantly tries to win her affections.

"Ruby and the Rockits" is a family affair as Shaun Cassidy serves as exec producer and brother Ryan is the set decorator.

"50 Ways to Heave Your Mother" airs Tuesday, September 15 at 8:30 p.m. on ABC Family.