Woaww you did a great work on this family.
Adolphe, Dolphis, Delphis is the same name. Dolphis or Delphis is a short name for Adolphe or Adolphis. Sophie, I don't know who she is, you are right, no information on her.
Alexander ? I found Alexis, born in 1836, baptism June 25th, 1837, in l'Orignal. He was 7 months,
https://familysearch.org/pal:/MM9.3.1/TH-1942-24485-23124-85...Alex, Alexis, Alexandre or Alexander is the same surname. I'm glad I found something you didn't.
I'm sure that Jean-Baptiste and Ann Whelan were married, but like you wrote, the parish register for this area are quite messy. If you have a look to the link I pasted above, you will find, after 1837 some records from 1835 that the priest found and copied from loose sheets.
Ann Whelan came for sure from the Big Irish Famine, 1845-1849
Thanks again for you help ! Have a Happy Year 2014.
Jacynthe