Thomas Alexander Young Keir
Spouse Name: Isabelle Leduke
Marriage Date: 7 Oct 1885
Marriage Location: East Hawkesbury Township
Delay Year: 1886
Registration number: 34654
Thos Alex Young Keir, aged 24, b English River,living Montreal, farmer, s/o James & Mary Keir married Isabelle Leduke, 23, born and living East Hawkesbury, single, d/o Henry and Elizth Leduke, witn: Robert James Keir of Huntingdon and Archd Mcduff of East Hawkesbury, 7 Oct 1885.
So Isabelle was a LeDuke not a Thompson.
SOrry that this messes up your research. Back to the drawing board.