Hi Dawn,
I know it's been 10 years since you posted your above query and I'm not sure if you're even still researching (or have found the information you were looking for), but my family on my husband's side is related to William and Eleonore through their son Melvin (the youngest brother of Genevieve). I have been able to trace this particular Pom(m)erville line back to Michel/Michael and Sophie (nee Dujardin/Desjardins), both born in Canada around 1806-1809.
Best regards,
Petra Otto, WI