Lady Lilias Graham daughter of John Graham, 4th Earl of Montrose, and Mary Rutwenn (1596–1641) Parents Mary Rutwenn John Graham, 4th Earl of Montrose Children Sir James Colquhoun of Luss, 4th Bt. Alexander Colquhoun, 1st of Tilliquhoun Katherine Colquhoun Lilias Colquhoun Jean Colquhoun Sir John Colquhoun of Luss, 2nd Bt. Siblings Lady Katherine Graham Lady Beatrix Graham Lady Dorothea Graham James Graham, 1st Marquess of Montrose Margaret Graham Partners Sir John Colquhoun of Luss, 1st Bt.