Hi Don. That Memorial photo you sent is for a different Honourable Alexander Grant, not the one from L'Orignal. Go to FindAGrave website, find Cassburn Cemetery in Ontario, lookup all GRANT, there he is. My guy ran Trading Post on Ottawa River called Duldraeggan Hall. His friend John MacDonell Jr. of Scotus had Trading Post downriver near Pointe Fortune, and this John's brother was Miles McDonell of Scotus, 1st Governor of Assiniboia [Manitoba] and member of HBC. The other guys were NorWesters, as were Peter Grant of Isle of Skye's sons Peter Jr. and Donald/ Duncan Grant, and their half brother John Grant of Lachine was biggest Shipper of Trading Goods, on St Lawrence and Ottawa Rivers.
Much history here, but you have to know your Grant. Cheers .