I have no connection to any of these families, but I have some general info for you.
See my separate posting of today's date about the long-ago origins of this family.
This reply to your post is to tell you to look at the current Nova Scotia phone listings using - www.canada411.com - You will see only 46 MADORE surnames, but the few that you need to contact are the ones in Pictou County and area, with phone numbers starting with 243- (Pugwash), 257- (Wallace Ridge), 396- (Westville), 485- (Pictou), 662- (Debert) and 895- (Truro). These places are all about one hour or less from Pictou, where your Madeore, Poirier, and Thorne people lived and married. These people are cousins to you (probably 3rd, 4th, or 5th) in some way or other. If you phone them, remember NS Time is ONE HOUR LATER than Maine Time. Area Code is 902.
An interesting fact is that there are no BOURLIERE surnames anywhere in Québec, but there are about 1,000 MADORE names.
Out of 89 THORNE surnames in all of Québec, about 25-30 are on the Magdalen Islands (in French they say "Les Iles de la Madeleine"). Go to the same phone URL as I mentioned above and put in "Quebec" from the drop-down menu, along with THORNE. The ones who would also be cousins of yours have Area Code 418 and they live in Fatima, Cap-aux-Meules, Étang du Nord, and Havre-Aubert.
There are 1,000's of POIRIER (means "pear farmer" in French) in Québec, but there are a number still living on the Magdalen Islands in places like Havre-aux-Maisons (82 families), Cap-aux-Meules (39), Fatima (33), and Grande-Entrée (4).
This is a tourist destination (bird and whale watching in summer) so lots of people can speak basic English as well as French. If you want to call them to ask questions (or try to get an e-mail or "snail mail" address), their time is THE SAME AS MAINE.
On the phone, be sure to speak slowly and clearly, and speak in simple sentences and ask very simple, direct questions about why you are calling (example: My name is --- and I am calling from ---. My family are THORNE and POIRIER from Magdalen Islands. My people were living in Pictou, Nova Scotia in [ give a date ]. Can you give me information about these names ?) If this is too difficult for them to reply immediately, ask them for their POSTAL ADDRESS or E-MAIL ADDRESS. If you write the information to them, they can get someone to translate it and give you good complete answers. IF YOU KNOW SOMEONE WHO SPEAKS and WRITES FRENCH (teacher, university prof, librarian, etc.) get them to write the basic message in French. Be sure to include all the information you already know, but keep it SIMPLE and IN ORDER). Every time you want to ask a specific question based on what youu have just explained, make that the end of a paragraph and start a new paragraph. This will avoid confusion about what you are asking.
Hope this is some help to you - you definitely have about 500-600 cousins in NS and Magdalen Islands.