Question: Who were the parents of the singer, who covered the song "So Sad About Us" and has a half-brother named David Cassidy?
Related documents: [0]  [DOC] "So Sad About Us" is a 1966 song by British rock band The Who, first released on the band's second album "A Quick One". Originally written for The Merseys, "So Sad About Us" has likely been covered more frequently than any other song on the album; according to the All Music Guide, it is "one of the Who's most covered songs". Shaun Cassidy, Primal Scream, The Breeders, and most notably The Jam and Dexter Romweber Duo (with backup vocal by Mary Huff of Southern Culture on the Skids) are among the many artists who have recorded studio versions of the song. [END] 
[1]  [DOC] Shaun Paul Cassidy (born September 27, 1958) is an American television producer/creator, screenwriter, and former singer and actor. He is the eldest son of Shirley Jones and Jack Cassidy. His older half-brother is David Cassidy. [END] 
Answer: 
Shirley Jones and Jack Cassidy
Shirley Jones and Jack Cassidy