Thanks for your message, unfortunately I don't have any information on the ancestors of Francois Julien Guerin, he might be linked to my ancestor, but a probably very distant relation.
Guillaume Guerin dit St-Hilaire my direct ancestor arrived in Quebec in 1693 and his father and mother were born around 1640 in Normandie (North West of France), I can't seem to find any details on his family back in France.
I keep my research going and I’ll let you know if I find anything that would link to your tree
Marc Alexandre Guerin-Thibault
Moncton, NB (Canada)