William Mackenzie politician, died 1814 (1791–1814) Parents Mary Proby Francis Mackenzie, 1st Baron Seaforth Children Siblings unknown daughter Mackenzie unknown daughter Mackenzie Frances Mackenzie William Frederick Mackenzie unknown daughter Mackenzie Helen Mackenzie, Lady Mackenzie Francis John Mackenzie Mary Elizabeth Frederica Mackenzie George Leveson Boucherat Mackenzie unknown daughter Mackenzie