found: Jeffris family pictures from a trip to Scotland, circa 1918?

when my Bepop died last fall, I took just a few pictures from his office, and am about to take a trip back to Chicago to help clear out the place for good. Here are a few of the strange tiny brownie pictures I found. They must have been taken by a relative of my grandmother, whose family was from Scotland and the Shetland Islands. I am guessing this is about 1915-1920? Some of them are marked, so I know they visited Stirling Castle, near Edinburgh. that's some serious gypsy business