Shirley Jones and stepson David Cassidy sang The Partridge Family single, “I Think I Love You” and it became a number 1 record.
Shirley's son, Shaun Cassidy’s record, “Da Doo Ron Ron” was also
Shirley Jones and Shaun Cassidy remain the only mother and son to
each have a #1 record. Also, Shirley Jones, David Cassidy, and Shaun
Cassidy remain the only mother/son/step-son trio to all have #1