I found the marriage on Ancestry.ca but the image does not seem to match. It is of very poor quality so if this is a family of interest the microfilm should be looked at as it appears there should be another page with the full particulars.
According to the information on the index page, Frederick was born in Lincolnshire in about 1891. His parents were William Brackenborough and Fanny Hill.
Frederick married Minnie Jackson, born in London England about 1895. She was the daughter of Charles Jackson and Annie S. Shorten Jackson. The marriage took place on 2 October 1916 in Grey County.
(MS 932 Reel 382)
Frederick enlisted in the army on 31 December 1915. He was residing in Feversham when he enlisted. His place of birth is given as Kirton Village, Lincolnshire and the date of birth as 20 November 1890. Frederick was an electrician. His regimental number was 838471.
Also listed are a daughter, Betty Ann. A search for a death record found a child to Frederick and Minnie who was stillborn on 10 May 1931 but no entry for 1930.
Also on the monument is a listing for Frederick's mother-in-law.
Note in the information on Frederick in these few resources, we have several different years of birth
1889 - tombstone 1890 - attestation papers and about 1891 on his marriage registration
The Greenwood Cemetery database gives the following information
Frederick's death 8 June 1968.
Minnie's death 16 December 1971 [no dates for her on the tombstone]
Betty Ann's death 10 May 1931 [her last name is entered as Brackenboro]
I have no connection to this family.