Her marriage registration should have name of her parents on it.
Both Maude and Robert died in BC. Here are their registrations.
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Death Date: 15 Dec 1932
Death Place: Vancouver, British Columbia, Canada
Name: Maud Mather
Gender: Female
Age: 77y 2m 2d
Birth Date: 13 Oct 1855
Birthplace: Rockland, Quebec
Marital Status: Widow
Spouse:
Father: Allan Cameron
Mother: Mccaul
Indian Agency:
Indian Band/Tribe:
Film Number: 1952656
Digital Folder Number: 4437655
Image Number: 3226
British Columbia Archives Film Number: B13145
Registration Number: 43630
Although no mother's first name is given, the last name is McCaul.
So son Allan Cameron Mather was likely named after his maternal grandfather.
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Death Date: 18 Oct 1925
Death Place: Point Grey, British Columbia, Canada
Name: Robert Addison Mather
Gender: Male
Age: 74y 10m 29d
Birth Date: 19 Nov 1850
Birthplace: Montrose, Scotland
Marital Status: Married
Spouse: M Mather
Father: John Mather
Mother: Jean Low
Indian Agency:
Indian Band/Tribe:
Film Number: 1927304
Digital Folder Number: 4437846
Image Number: 218
British Columbia Archives Film Number: B13127
Registration Number: 2219
Death Date: 27 Jul 1953
Death Place: Vancouver, British Columbia, Canada
Name: Allan Cameron Mather
Gender: Male
Age: 67y 3m 24d
Birth Date: 03 Apr 1886
Birthplace: , Ontario
Marital Status: Single
Spouse:
Father: Robert Mather
Mother: Maude Cameron
Indian Agency:
Indian Band/Tribe:
Film Number: 2032875
Digital Folder Number: 4438078
Image Number: 2078
British Columbia Archives Film Number: B13216
Registration Number: 53 09 007550
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Death Date: 17 Feb 1954
Death Place: Vancouver, British Columbia, Canada
Name: Annie Eva Mather
Gender: Female
Age: 75y 0m 18d
Birth Date: 30 Jan 1879
Birthplace: Ironsides, Quebec
Marital Status: Single
Spouse:
Father: Robert Addison Mather
Mother: Maude Cameron
Indian Agency:
Indian Band/Tribe:
Film Number: 2032872
Digital Folder Number: 4438077
Image Number: 2664
British Columbia Archives Film Number: B13218
Registration Number: 54-09-00204
You have the 1901 and 1911 census so you know all their birthdates. You didn't have a birthdate for Fred but 1911 says he was born Feb 1888 Ontario.
Firt born son was named John after his grandfather but that seems to be the only traditional naming system carried out in this case.
I can't find anything on the Cameron/McCauls on Druoin Collection [Quebec vital stats] which is unusual. Where did you find Eva's baptismal and their marriage?
Many many Allan/Alexander Camerons on 1861 and 1871 census.
Margaret is in Rockland Russell County Ontario according to OCFA.
Margaret Cameron [McCaul], Edward Street Prostestant Cemetery, Clarence Tsp, Russell County, Reference: OT-89-08.
An Alex is also buried there. Same information as above.
http://ocfa.islandnet.com//search.phpI don't see where the cemetery is on line but the above site will give you a contact for the cemetery.
I did not find a death for either Margaret or Allan/Alexander. If she died in 1861 then she wouldn't be registered.
There are 3 McCauls buried in the same cemetery, Catherine, Dugall and Margaret.
I cannot find Catherine/Dugall in any census.
Could Lochaber be Lochinvar of Glengarry County?