Hi, I think I have the informations you're looking for.
The name is not Goudreau but Rondeau.Lambert Robillard married Louise Rondeau on the 21st of November 1808 in St-Benoit (de Mirabel), and his father Charles married Elizabeth Saumier (Saulnier) the 6th of February 1769 in Pointe-Claire.One son of Lambert, Basile was married in 1838 in Les Cèdres (situated not far from where I live).
So Lambert Robillard married Louise Rondeau the 21st of November 1808 in St-Benoit.
His father is named Charles who married Elizabeth Saumier on the 6th of February 1769 in Pointe-Claire.
The name of Louise's father is Thomas Rondeau who married Elizabeth Rodier in 1789 in Deux-Montagnes (which is near St-Benoit).I couldn't find the names of Thomas'father or Elizabeth's.I'm stucked there.If you find something new let me now and I'll do the same if something come up.