There was some Tremblay around Grande-Rivière at that period, there is some left. If you have dates, it will be easier.
Concerning the métis, if the governments had not legiferate on the natives and métis, the assimilation would have been complete by now and you would not ask these questions today. Love was stronger than the blood lines, as it is easier today. In the states, more and more white people find they were of negroid heritage. Again, love, and lust, was stronger than hate. The human race is a complex breed.
I was told once that my grandmother might have been of native influence. The Joncas originated from France, and further from Spain of Basque influence. There could be influence from the Hannibal armies when they invaded Europe, thence arab influence. So our ADN goes a long way. Sometimes, like the negroid features, it pops out.