I am researching John SCOT and Mary CREIGHTON, my 7G grandparents.

I have a marriage record for their son Andrew, m. Marie Charlotte Serre dit St. Jean, 23 May 1779, Quebec. Andrew was likely born in Sligo (county? town in county? not sure), Ireland. I have seen his mother's name as:

Crichton,
Cracheten,
Creighton,
Rocheteau,
Nacheleau.

Does anyone know anything more definite about John and Mary? Thank you!