Carol,
Here is the information I have:
George Anderson Johnston Sr.
Born:  May 9, 1862, Newton, Airlie, Angus
Died:   Jan. 15, 1937, Dundee
      Married:  April 6, 1886, Dundee
Isabella Waddell Millar
Born:  Jan. 20, 1861, Flowerdale, Collace, Perthshire
Died:  Sept. 24, 1946, Arbroath Road, Dundee
Children:
l. William Johnston
Born:  1886
Died:  June 14, 1950, Dundee
     Married:  Jan. 25, 1922, London, England
Margaret Mary (Daisy) Third
Born:  Apr. 7, 1892, Angus
Died:  June 25, 1974, Montrose
2. Margaret Anderson Johnston
Born:  Apr. 13, 1888, Dundee
Died:  Dec. 22, 1954, Dundee
     Married:  Oct. 7, 1925, Dundee
William Johnston IV
Born:  Jan. 17, 1892, The Guynd, Carmyllie, Scotland
Died:  Nov. 15, 1966, Dundee
3. Robert Miller Johnston
Born:  1891
Died:  Aug. 26, 1967, Dundee
     Married:  Apr. 20, 1930
Janet Smith
Born:  1886
Died:  Aug. 26, 1967, Dundee
(I don't have info re children)
4. George Anderson Johnston Jr.
Born:  Apr. 29, 1893, Downfield, Scotland
Died:  May 2, 1966, Dundee
     Married:  Aug. 14, 1929, Dundee
Elizabeth Dorward Johnston
Born:  Nov. 30, 1895, The Guynd, Carmyllie, Scotland
Died:  June 20, 1985, Dundee
5. Charles Miller Johnston
Born:  Oct. 24, 1896
Died:  Feb. 18, 1970, Montifieth, Angus
     Married:  Jan. 25, 1925, Dundee
Jeannie Douglas Arthur
Born:  1899
Hope this helps.
Regards,  
Kathleen