Kammala jumla mai zuwa: A cikin 1751, an haifi Simon McTavish a Stratherrick a cikin Highlands na Scotland, ɗan John McTavish (1701<unk>1774), mai kula da takaddama na Garthbeg, wanda ya ɗauki makamai na McTavishes na Garthbeg. Mahaifiyarsa, Mary Fraser (1716<unk>1770) na Garthmore, ta fito ne ta hanyar Simon Fraser na Dunchea da Frasers na Foyers, daga wani ɗan da ba shi da izini na 1st Lord Lovat. Mahaifin McTavish ya yi yaƙi a matsayin jami'in soja tare da sojojin Jacobite a yakin Culloden da
Falkirk Muir, kuma yana daya daga cikin 'yan kalilan da aka ambata musamman don "ba" karɓar gafara daga George II bayan da aka ci nasara da Jacobites.