He was named a life member of the Centre francophone de Vanier, and was active in the Knights of Columbus.
[1] He ran for the Ontario legislature in the 1981 provincial election, but lost to Bob MacQuarrie in the riding of Carleton East (future NDP cabinet minister Evelyn Gigantes finished third).
[2] On December 13, 1984, he was elected in a by-election to succeed retiring MPP Albert Roy in the riding of Ottawa East.
[4] In the latter capacity, he played a major role in passing the province's French Language Services Act in 1986.
The Liberals won a landslide majority in the 1987 election, and Grandmaître defeated his nearest opponent by almost 15,000 votes.