Supposedly, according to the child's mother, who seems to have been involved with David at some point but Katie just appeared out of nowhere as a teen wanting to be a star and record "I think I Love You" by David and The Partridge Family. She then wanted to be on TV and made a big deal out of being a "Cassidy" to get there. So in reality, questionable.
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Are they Brothers?
Ted Cassidy was born on July 31, 1932.
No, if Sean Cassidy is the spelling of the person of whom you are inquiring. Nevertheless, Shaun Cassidy -- who portrayed Joe Hardy on "The Hardy Boys" in the 1970s TV series. Then, yes, David and Shaun Cassidy are half brothers, they have different mothers. Their father was Jack Cassidy.
No.
Jack Cassidy
Ted Cassidy is the famous actor who played the character of Lurch in the Addams Family Movie. He has done many movies but he role of Lurch was his most notable role played.