Hi Barbara !
I've came back from vacation.
I have some informations for you.
I went to Wotton this week. I bought the Wotton's book. It's 65$ CAN and there's a lots of books available at the City Hall. I did the whole cemetary to find our ancestors. I didn't found any graves for Louis Duplin but there's some others Duplin buried in there. Some graves was in too bad condition to be able to read on it. Some graves was also under the church.
I will try to translate you the pages I got for the Duplin genealogy in the Wotton's book. I'll scan some pictures too. Let me take some times to do that.
Oh, I found something interesting on the Eastern Township map, there's a village or a parish between St-Camille and Stoke that is called Duplin. I read that some of your ancestors was married in St-Camille.
Another hint, Duplin cames from "d'Upland". The only Upland thing I found in Quebec is a region between Lennoxville and Ascot at 45 mins from Wotton.
For information, look at http://www.uplands.ca/eng/home.html
Also I know that there was an abenakis tribe in a city at the south of Lennoxville called Coaticook. Coaticook's name comes from "koatikeku" in abenakis. I don't know if there is any valid relation between theses informations and your ancestors but it may help you. You know, the Eastern Township history is very complicated!!
I'll let you know when I'll be able to send you pictures and text from the book. Meanwhile, you can look at the map attached to this post.