Hi, You have the Information re the mothers will and
Notary Public. Your source for that Information?
Original information should show his address at the time.
Information may be held at the State Archive.
snip
Notorary Republic and witness to John signing the paper, that he received the money from his mother's will come up in:
Upper Squaw Creek, Idaho, US in the 1910 Census.
Notorary Republic: Sherman Glenn.
Witness:George Peron.

Probated Will - may show names and addresses of all Beneficiaries. Files may have been transferred to the Provincial Archive.

In 1910 John RUSSELL b. 1864 would be aprox 49 years of age.

John RUSSELL - b. 1864 would have probably been considered to old to serve in WW1
Searching National Archive of Canada Boer War
http://www.collectionscanada.gc.ca/databases/south-african-w...
there are a number of John RUSSELL -no year of birth shown
#2 has a brother William.

Naturalization:
DON't Depend on always finding information at Ancestry. It is an excellent source of Information - BUT - it is an ongoing project -
If U.S. Citizenship was applied for -
The State Archive where application was made should have records -
National Archive in Washington DC - should have records.

WILLS: Not everyone leaves things to siblings,etc -so not finding John Mentioned in the wills of his brothers, sisters should not be a surprise. Some may leave a small remembrance others nothing at all. Wives and children usually come first.

Re Marriages- Provincial Archive of BC Index Online
The Index - will show name of bride and groom - but no age or place of birth. Registrations will give that information.
UNFORTUNATELY - Random Acts of Genealogical Kindness -Volunteers are no longer Available.

Did you search in Ontario re a Possible marriage?

Cheers, Stella.