Major David Walter Wedderburn1 
He gained the rank of Major in the Royal Engineers.1
Children of Major David Walter Wedderburn and Elizabeth Robertson
- Patricia Helen Marjorie Wedderburn+2 b. 1927, d. 2008
- Averil Elizabeth Vernon Wedderburn+2 b. 18 May 1932, d. 2013
J. Robertson1
Child of J. Robertson
- Elizabeth Robertson+2 d. Nov 1950
Elizabeth Robertson1 
From 1925, her married name became Wedderburn.
Children of Elizabeth Robertson and Major David Walter Wedderburn
- Patricia Helen Marjorie Wedderburn+2 b. 1927, d. 2008
- Averil Elizabeth Vernon Wedderburn+2 b. 18 May 1932, d. 2013
Patricia Helen Marjorie Wedderburn1 
From September 1950, her married name became du Plessis.
Children of Patricia Helen Marjorie Wedderburn and Colin Henry du Plessis
- Robin St. Clair du Plessis+2 b. 1951
- Richard Geoffrey du Plessis2 b. 1952
- Alan David du Plessis+3 b. 1955
- Piers Raymond du Plessis+3 b. 1960
Nicholas du Plessis1
Child of Nicholas du Plessis
- Colin Henry du Plessis+2 d. 1988
Colin Henry du Plessis1 
Children of Colin Henry du Plessis and Patricia Helen Marjorie Wedderburn
- Robin St. Clair du Plessis+2 b. 1951
- Richard Geoffrey du Plessis2 b. 1952
- Alan David du Plessis+3 b. 1955
- Piers Raymond du Plessis+3 b. 1960
Robin St. Clair du Plessis1
Children of Robin St. Clair du Plessis and Lynette Payne
- Gillian du Plessis3 b. 1976
- Bradley St. Clair du Plessis3 b. 1981
Richard Geoffrey du Plessis1
Averil Elizabeth Vernon Wedderburn1 
Her married name became Bornman.3
Children of Averil Elizabeth Vernon Wedderburn and Johan Christiaan Frederick Bornman
- Helen Patricia Bornman3 b. 1966
- Marjorie Ann Bornman3 b. 1967
Patricia Eileen Margaret Wedderburn1
From 14 October 1931, her married name became Waugh.