A few years ago I came across, online, an ancestral grave for a "Thomas Pouchee". I wish I had saved the source as to what cemetery and town it was in. All I can tell you is that it said Thomas Pouchee was born in France and died in 1745 at the age of 70.
I do remember the grave was in NB and the town where it was...started with the letter B.
What got me about this is if Thomas died in 1745 at the age of 70, it means he was born abt 1675. Gabriel Pouchee was b. abt. 1698 which means Thomas was approx. 23 when Gabriel was born.
I have no proof but if the info I found is right then it is possible that Thomas is Gabriel's father.