Hi,
I am presently working on my familly history and I have some informations related to Cayer's familly. Take note that all the Cayer's origin name is Caillé or Caillier or Cahier. It seems that there was 2 ancestors to emigrate to Canada: Caillé Antoine dit Brûlefer dit Biscornet 1674 and one Caillé Jean dit Le Picardier in 1683.
As per the Blue Drouin, Benjamin Cayer was the son of Alexis Cayer and Adeline Desorois-Lincourt married to Marie-Adélie Cardin (daugther of Grégroire Cardin and Esther Duhamel) on february 2, 1880 in St-Pie de Guire.

That's all I have for the moment. If you want more information, please let me know and I will try to get more.

Regrads,

Réal Cayer
Deux-Montagnes, Québec, Canada