Bridget and Maynard Sinton at their family home of Ballyards, County Armagh, June 17, 1921, by H. Allison & Co. Photographers, via Public Record Office of Northern Ireland Commons on flickr.
That retractable striped awning emerging from the terrace roof looks very sleek and was brand new. A ca. 1920 photo of the house in this biography of the children’s father shows the terrace with no cover. (You can read a brief history of awnings here.)
Ballyards was built in 1872 and sold to the father, a linen manufacturer, in 1908. He almost doubled its size and called it “Ballyards Castle.”

Maynard was killed in WWII, but Bridget (age 7 in these photos) lived until 1975.