Mary Cecilia Knatchbull-Hugessen (born 1929) (b. 1929) Parents Adrian Knatchbull-Hugessen Margaret Cecilia Duggan Children Martha Paganel Keynes Toby William Keynes Elizabeth Harriet Keynes Zachary Edmund Keynes Gregory Robert Edward Keynes Siblings James K. Hugessen Edward Herrick Knatchbull-Hugessen Andrew Hugessen Kenneth Wyndham Knatchbull-Hugessen Partners Stephen Keynes