Mary,
I'm glad to help with your searches. Other information on your family are:
Robert C 1842-1919 Mon. Inscription
Burial: Borough Cemetery, Douglas 3 5 Feb 1919 grave No G131
G131 In loving memory of Robert Cretney formally of the Braaid died 2nd February 1918 aged 76 years. Also Margaret wife of the above died 19th October 1916 age 75 years. Also James Cowley Cretney Cpl. Canadian Engineers, son of the above died in France of wounds 11th April 1916 age 34 years. Also Susannah youngest daughter of the above died 13th January 1941. Cretney.

Brother James Cowley also emmigrated and joined up in WW1
CRETNEY, JAMES
Nationality: Canadian
Rank: Corporal Regiment: Canadian Engineers Unit Text: 2nd Field Coy.
Age: 34 Died 11/04/1916
Service No. 5352
Son of Robert Cretney, of Douglas, Isle of Man.
Casulty Type: Commonwealth War Dead
Grave/Memorial: VI. G. 24.
Cemetry: RAILWAY DUGOUTS BURIAL GROUND
Also your GG/fathers census docs are on Canadian census 1911 This shows he emmigrated in 1891 to Fort Steele BC.
see web site "data2.collectionscanada.ca/1911a/e078/e001936968.pdf."
I apologise for the format but I've pasted data for my simplicity. I think that is enough for you to take in for now.
I would be interested in the Canadian Cretney family tree from Edward Ceasar as I'm tracing all Cretney linksin USA & Canada
I have other Cretney emmigrants to Canada, but that's another day.
Bye for now Allan Cretney