No, Kate Wagner was her step-daughter. She is the daughter of Robert Wagner and his second wife whom he was married to between his marriages to Natalie.
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Robert Wagner has been married three times in his life. His first wife was actress Natalie Wood. His second wife was Marion Marshall with whom he has a daughter Katie Wagner. He remarried Natalie Wood and they had a daughter Courtney Brooke. After Natalie died he married Jill St. John. One of Robert Wagners more famous parts was Jonathan Hart in Hart to Hart with Stephanie Powers. In an interesting twist Natalie Wood, Jill St John and Stephanie Powers all took dance with the same teacher as children and got together for a Christmas picture. Jill St. John calls the picture "He married them all"
As gay as they come. That is the reason Natalie Wood died. She saw him having oral sex with Chrostopher Walken EDIT: The above answer is little more than gossip. While it is true that Wagner was rumoured to be gay, there were no witnesses to what happened on the boat that night, so it cannot possibly be known whether anything of a sexual nature happened between Wagner and Walken
Natalie wood
West Side Story
Natalie Wood had two husbands: Richard Gregson and Robert Wagner.
Robert Wagner has been married three times in his life. His first wife was actress Natalie Wood. His second wife was Marion Marshall with whom he has a daughter Katie Wagner. He remarried Natalie Wood and they had a daughter Courtney Brooke. After Natalie died he married Jill St. John. One of Robert Wagners more famous parts was Jonathan Hart in Hart to Hart with Stephanie Powers. In an interesting twist Natalie Wood, Jill St John and Stephanie Powers all took dance with the same teacher as children and got together for a Christmas picture. Jill St. John calls the picture "He married them all"
Natalie Wood had two daughters: Natasha Gregson (born September 29, 1970) with Richard Gregson, and Courtney Wagner (born March 9, 1974) with Robert Wagner.
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Robert Wagner married to Natalie Wood in December 28, 1957 Robert Wagner married to in July 16, 1972 Robert Wagner married to Marion Marshall in July 21, 1963 Robert Wagner married to Jill St. John in May 26, 1990
Robert Wagner has been married three times in his life. His first wife was actress Natalie Wood. His second wife was Marion Marshall with whom he has a daughter Katie Wagner. He remarried Natalie Wood and they had a daughter Courtney Brooke. After Natalie died he married Jill St. John. One of Robert Wagners more famous parts was Jonathan Hart in Hart to Hart with Stephanie Powers. In an interesting twist Natalie Wood, Jill St John and Stephanie Powers all took dance with the same teacher as children and got together for a Christmas picture. Jill St. John calls the picture "He married them all"
The Jack Benny Program - 1950 Natalie Wood Robert Wagner Show 10-12 was released on: USA: 6 March 1960
Natalie Wood
The circumstances surrounding Natalie Wood's death are still unclear. Robert Wagner, her husband at the time, denies any involvement in her death. Wood's death was officially ruled as accidental drowning.
When she died she was married to Robert Wagner. It was their second marriage together. She was also married to Richard Gregson between her relationships with Wagner. She had daughters with both husbands.
Robert Wagner married to Natalie Wood in December 28, 1957 Robert Wagner married to in July 16, 1972 Robert Wagner married to Marion Marshall in July 21, 1963 Robert Wagner married to Jill St. John in May 26, 1990
Natalie Wood and her husband Robert Wagner were supposedly out on a leisurely cruise on their boat when Natalie fell off. To this day it is still unclear how Natalie fell overboard, whether alcohol was a factor in the accident, or if it was indeed an 'accident' at all.