I looked at the marriage registration for William Smith and Agnes Robertson and it gives William's parents as Thomas Smith and Margaret Makin. There was a William Makin Smith born in Alva, Clackmannan in 1898 (family trees at Ancestry give the date as 11 Oct 1898). If this is the correct person the family trees posted indicated he married Edith Joliffe on 14 Aug 1930 and died 25 May 1963. The family trees don't say where he married Edith or where he died. They also don't have information on a first marriage.
Also on the marriage registration for William and Agnes, it indicated that Agnes' address was 95 Restaloig(?) Road, Edinburgh. I found an incoming UK passenger list entry for Agnes Smith who gave a UK address of 95 Restalric Road, Edinburgh. She was on the Athenia which arrived in Glasgow on 29 May 1927. The passenger list had her travelling alone.
I also found Form 30 cards for William, Agnes and two daughters. They arrived in Quebec on 18 May 1924 on the Marburn. William was listed as being 23, born in Alva, Clackmannan and was destined to his father, Mr. Thomas Smith of Toronto. For some reason he listed Agnes as his nearest relative from the country he came from even though she was with him. Agnes was 25, born in Edinburgh and listed Thomas Smith as the person she was joining. She lists her nearest relative in the country she left as David Robertson, father, 95 Restaloig(?) Road. The two children were Sarah (2) and Margaret (11 months).
Jacquie