Thank you, Ian and Carole . . .
for all your help. I can't tell you how much I appreciate it.
Ian, I browsed, as you instructed, and found Maria's family. I also looked to see if William Hines (Haines) and son William Robert Haines were both born in Blakeney, and didn't find anything. So that leads me to believe that William Hines and his son were born elsewhere.
Although I've not checked all the birth records in the Blakeye-Norfolk section, from what I've seen so far, no Haines are on written on the pages.
I've just re-read the burial registry for William Robert Haines from the Anglican Diocese of Montreal, and I see that it's only his mother who's from Blakeney, as it is written: "William Robert, son of William Hopkins Haines and of Maria Ann Mansfield of Blakeney, Norfolk ...." There is no comma after Mansfield.
Carole, I'll look into trying to get a copy of the marriage certificate.
Until then, the search continues . . .
Good day to you both,
Jack