From the indexes at Scotland's People.
It looks as if he was born in Edinburgh in 1901.
The index to the 1911 census lists in Edinburgh St George ED23 p 8
Alexander James, 74
Robert H James, 46
Arthur H James, 9
Gertrude H James, 8
Douglas H James, 5
Margaret J James, 1
Gertrude Hood James was born in 1903 and died in 2000
Douglas Hood James was born in 1907 and died in 1991
Interestingly, neither of their death certificates indexes a mother's maiden surname. Nor are there records of them marrying in Scotland.
Robert Hood James died in 1944 aged 80. He married Margaret G Johnston in 1900 and Annie Davina Fairbairn in 1915. Margaret Goldie Johnston or James died in 1910 aged 40. Annie Davina Fairbairn or Hood died in Galashiels in 1964 aged 73.
There are two deaths with mother's maiden surname Fairbairn
Elizabeth Murie James, other surname Ogilvie, died in 2002 aged 86. Born 1916, married 1941 to John Ogilvie.
Laura Millicent James, other surname Glover, died 2004 aged 86. Born 1918, married 1941 to John Hardie Glover.
Margaret Johnston James, other surname Aitchison, mother Johnston, died in 1993 aged 83.
Arthur Hood James was married twice; to Norah Elliot Graham in 1925 and to Julia Margaret Morris in 1928. Norah Elliot Graham or James died in 1926 aged 26.
Margaret Graham James, other surname Adams, mother's surname Graham, died in Stirling in 2020, aged 93. However I can't find a marriage or birth of Margaret Graham James so she may have been Adams married to a Mr James.
All events in Edinburgh or Leith unless otherwise stated.