« Reply #10 on: Friday 20 May 11 17:47 BST (UK) »
There is a birth in the Manitoba Vital Statistics database for at least one of the children. He was born Lewis Roy Irwin on 2 Nov 1899 in Winnipeg - mother's name listed Olive Irwin. It appears to have been a delayed registration since the registration date listed was 1955. You might want to consider ordering a copy of the birth registration to confirm his father's name (if it's listed) - it would cost $10 when you include the information from the database.
I found an article in the Winnipeg Free Press from 1929 regarding Sidney's death. It indicated he had a heart attack and was found dead on a sidewalk near his home. It also said he was living with his son. I've been able to confirm he was living with Walter at that time through another newspaper article about Walter from later in 1929 which had the same address. There was no mention of Olive or any other children.
You may want to consider ordering a copy of Sidney's military file. There may be some mention in it of money being taken from his salary or pension to go to his children by Olive. You can order it at the Library and Archives Canada website and the cost is dependent on the size of the file.
Jacquie
Canada: Patterson, Brown, Haidenger/Heidinger, Meyer, Johnston(e), Gorsuch, Kitchin/Kitchen
United States: Patterson, Smith, Brown, Vance, Bower(s), Newberry, Best, Love, Gorsuch
England (Northumberland): Brown, Whitfield, Henderson
Scotland (Glasgow, Edinburgh, Fife, East Lothian): Johnston(e), Bell, Galloway, Campbell, Robertson, Williamson, Thomson, Crawford
Germans from Russia: Haidenger/Heidinger, Meyer, Meach, Lorenz