David Macmillan born 1957; youngest child of Maurice Macmillan, Viscount Macmillan of Ovenden, and Hon. Katharine Ormsby-Gore (b. 1957) Parents Katharine Macmillan, Viscountess Macmillan of Ovenden Maurice Macmillan Children Finn Macmillan Mabel Macmillan Siblings Joshua Macmillan Alexander Macmillan, 2nd Earl of Stockton Adam Macmillan Rachel Macmillan Partners Arabella Pollen