Among their children were: Maria's eldest sister had married a Thomas Binny, who had traded at Madras and retired to St Andrews, Scotland.
[4] John Russell Colvin (1807 – 1857), the second son of James, rose to be lieutenant-governor of the North-West Provinces of British India during the mutiny of 1857, at the height of which he died.
He married Emma Sophia, daughter of Wetenhall Sneyd, a vicar in England; they had ten children,[5] many of whom continued the family connection with India.
Bazett Wetenhall, Elliott Graham Colvin, and Walter Mytton Colvin all passed distinguished careers in India, and a fourth, Clement Sneyd, C.S.I., was secretary of the public works department of the India Office in London.
The third son, Auckland Colvin (1838–1908), was lieutenant-governor of the North-West Provinces and Oudh, and also served in Egypt.