Bit of an anti climax in face of the list of James' McGREGOR's parents and siblings... (and I notice some anomolies on the Ancestry tree Deb, did you notice - when you look at Margaret - it seems to be a different person - some sorting to do there between the various trees - one seems to have her as Maiden name McGREGOR the other as McDERMAND .........but....anyway,,,,,

MARRIAGE
Alex McGREGOR age 30, bachelor, b Euphemia, residing Euphemia- Farmer son of James McGREGOR and Lydia OUTHOUSE
Married 1900 Lambton
Alice M BLAIR age 26, Spinster, b Mostan? India, Residing Euphemia, dau of Wm BLAIR and Jane HAW (HAIN??)
CENSUS 1911
Alexander McGREGOR 42, b Dec ----?, Ontario
Wife: Alice 36, b ---? 1879, India
Son: Wallace 10
Dau: Phyllis 1??
Lodger: Lydia McGREGOR 69, b Sep 18--?
And - an Alex McGREGOR was the Enumerator of this Census record tooBIRTH:
8 Apr 1874, Euphemia, Lambton, Ontario
Alexander McGREGOR, male,
Parents: James McGREGOR, Freehold Farmer, and Lydia OUTHOUSE
I think this is a huge error - on part of parents and/or registrar/and/or the Doctor who was the Informant. And this birth is actually meant to be Nellie!!
Everything else for Alex points to him being born Dec 1869.Cheers
AMBLY