Helen Mackenzie, Lady Mackenzie (1798-1866) (1798–1866) Parents Mary Proby Francis Mackenzie, 1st Baron Seaforth Children Siblings unknown daughter Mackenzie unknown daughter Mackenzie Frances Mackenzie William Frederick Mackenzie William Mackenzie unknown daughter Mackenzie Francis John Mackenzie Mary Elizabeth Frederica Mackenzie George Leveson Boucherat Mackenzie unknown daughter Mackenzie Partners Joshua Mackenzie, Lord Mackenzie