Dudley and his wife Margaret Hilda HARLAND had son Dudley Robert Harland YEOWARD in 1923. He served in WWII as did his father in some capacity. See NAA Recordsearch. Son Dudley R H died in SA in 2011. His father was his nok so perhaps he did not marry. There are only a few YEOWARDs in SA and only 2 in Victoria, so the white pages phone directory is worth a try!