Hi Lisa, Maybe we should take a Mulligan on this one? Start a new thread, posting transcriptions of all records you have. There are two Omer St. Pierres in Manchester, Hillsborough, New Hampshire. In 1910 one of them is Omer J. St. Pierre age 35 married to a Pearl age 33 (as your volunteer states). This couple matches the information you state - which did not include a birth date for either "your" Omer or Pearl.
However you say "your" Omer is married to a Delia in 1910.
A transcription of records rather than a conversation alluding to records is VERY helpful in keeping things straight and clear.
Thanks and hope you don't mind the request, which is meant to be respectful and grows from my interest in your intriguing family history question.