Re Glenlivet and WILLIAM GORDON OF LETTOCH, The Braes of GLENLIVET:
William GORDON was my 3G uncle, married Anne GRANT, his second wife; Children, using Scots numbering dd/mm/yyyy:
Robert c.01.01.1782 m. Margaret MCLEAN 1805?;
John c.03.11.1783 m. ... Reid, gdaughter of Minmore GORDONS 01.08.1809;
Isobel c.23.03.1786 m. Charles MACPHERSON;
James c.28.02.1789, Spanish Consul, Leith;
Mary c.31.10.1794 m. William COUTTS;
William c.15.01 1797, Gordon Highlanders, d. Lake Champlain, Quebec;
Grace/Grizzel c.04.05.1801 m. James RATTRIE;
Magdalena c.13.05.1804 m. John MACKAY.
I am gradually getting info on the Gordons of Lettoch on to the Glenlivet Project site, albeit slowly due to illness. Hope that's of some help?