updated May 2010
Walter Malcolm Graham was the 4th child of William Montague Graham and grandson of William Graham, a soldier from Scotland serving in the HEIC army, and his second wife, Eliza Montague.
The information I have about this branch of the family has come from another researcher who is a descendant of Walter Malcolm Graham, and from the updated births, marriages and deaths records on the LDS FamilySearch website.
Walter Malcolm Graham married Eileen Westerman in Bangalore in 1875, they had at least twelve children, of which only 8 survived to their first birthday.
Looking at the birth records, the family lived in Madras up to about 1904 and then in Calcutta.
I have not been able to discover Walter's occupation, a search of the ecclesiastic records at the British Library might reveal some more information about this.