He was father to Alexey Greig, admiral of the Imperial Russian Navy and father-in-law to Scottish science writer and polymath, Mary Somerville who was a distant cousin of his.
He was father to Alexey Greig, admiral of the Imperial Russian Navy who would go on to have his own spectacular career in the Russian Navy. Greig was father-in-law to Scottish science writer and polymath, Mary Somerville who was a distant cousin of his.