Lady Mary Mackenzie Peerage person ID=510510 (d. 1726) Parents Kenneth Mackenzie, 3rd Earl of Seaforth Isabel Mackenzie Children Isobella Macdonell Alexander Macdonell Randulph Macdonell Donald Macdonell John Macdonell, 12th of Glengarry Siblings Kenneth Mackenzie, 4th Earl of Seaforth Lady Isabella Mackenzie Lady Margaret Mackenzie John Mackenzie Partners Alastair Macdonell, 11th of Glengarry