Lady Katherine Graham Peerage person ID=245695 Parents Janet Edmonstone William Graham, 1st Earl of Montrose Children Sir John Colquhoun of Luss Helen Colquhoun Marion Colquhoun James Colquhoun Siblings Lady Margaret Graham Elizabeth Graham Patrick Graham, 1st of Inchbrakie and Aberuthven Lady Jean Graham Lady Jean Graham Walter Graham Jonet Grahame William Graham, 2nd Earl of Montrose