Hi
There are school records for a Port Elphanstone School
Alexander Banks Graham born 15.11.1904
Jane Banks Graham born 12.11.1902 Guardian is a Mr Donald West House.
If this is your chap then he is son of James Fraser Graham 1868-1910 and Jane Balfour Banks 1866-1942.
The couple had a very large family besides Alex and Jane.
Isabel Banks Graham 1889 ,Francis Banks G 1890,Jessie 1892,James 1894,Margaret 1896 ,George 1897,Alfred 1900 and Ann Dey Graham 1909.
They lived in Berry st Aberdeen and James was a comb maker.
Given the number of siblings I'd assume quite a few relatives out there.
Ciderdrinker