Marian Blakiston-Houston (1905-1991) (1905–1991) Parents Richard Blakiston-Houston Lilian Agnes Kidston Children John MacMillan George Gordon MacMillan of MacMillan and Knap David MacMillan Andrew Allardice MacMillan Elizabeth Judy MacMillan Siblings Elizabeth Blakiston-Houston George Blakiston-Houston John Matthew Blakiston-Houston Partners Gordon Holmes MacMillan