Ah, I'm glad you asked me that (no, really!). My mother was a Crail woman, and often spoke about "Granny Watson". I've seen the photo you mention. When she was 100, they offered to buy her a washing-machine to make it easier for her to wash the football shirts, and she was incensed, thinking they were hinting that she was past it. Every time she sneezed the word went round Crail that this time Granny Watson was on the way out, but she hung on in there. One day she passed out in a shop in Crail, but when they revived her and wanted to take her to the doctor she pooh-poohed their efforts, saying she had come out without her cup of tea that morning and that was all that was wrong.
I have details of her family-tree which I worked out earlier this year with the help of Scotlandspeople. She started life as Jessie Terras Scobie, born in Crail in 1875 to Andrew Stobie and Helen Watson (daughter of Thomas Watson and Helen Balsillie). These are Crail Watsons - but in 1894 Jessie married fisherman Henry Watson, son of James Watson and Janet Cowe, who came from Northumberland, from where they moved to Cellardyke - my home town - from where they moved the 4 miles to Crail.
As an amateur historian of Cellardyke (my book about the place was published in 1986 by John Donald Ltd.), where Watson was the commonest surname for hundreds of years, it has always intrigued me that this English couple called Watson moved there in Victorian times. They must have felt at home among all the other Watsons!
James Watson and Janet Cowe also had a son called John who was known in Crail as "English Jock". He was quite a character, and you can see his photo and read about him in one of those books of old photos of Fife. I've forgotten the author and title, but it's on my bookshelves somewhere.
Harry