 He was later created Earl Fife and Viscount Macduff, also in the peerage of Ireland, by letters patent dated 26 April 1759, after proving his descent from the MacDuffs, Earls of Fife.Lord Fife died on 30 September 1763, and was buried in the parish church of Grange, before being moved to the mausoleum at Duff House.By his second wife Jean he had five sons and six daughters.