Mr and Mrs Malcolm

Given the context of the album, I would have said that these were the parents of John Wingfield Malcolm, namely John Malcolm, 14th of Poltalloch, and Isabella Harriet née Wingfield. Only Isabella Harriet Malcolm died on 30 September 1858 and this portrait was taken in the early 1860s.

From an album probably compiled by either George Charles Pratt (1799-1866), 2nd Marquess Camden or by his son, John Charles Pratt (1840-1872), from 1866 3rd Marquess Camden.

Photographed by Camille Silvy of London on 8 April 1860.