Shaun Cassidy, who shared a father with David, posted a black-and-white photo on Instagram to recall the time they spent together as young children. “When David came to visit us on the weekends ...

The Partridges, Western-style? “David Cassidy was why that show became so popular, and by the time I arrived, he was already a megastar, a full-on rock star,” Bickley remembers.