 In 1814 Baron Wallace aged 46 he married Lady Jane Hope (1766-1829), Viscountess Melville (widow of Henry Dundas, 1st Viscount Melville), daughter of John Hope, 2nd Earl of Hopetoun.Lady Jane died in June 1829.Lady Jane was then 48 and well beyond child-bearing years, even had she been able (she had no children by her first marriage).