Big Sister is the highest among the three sisters, and also the highest point in Canmore.
The approach is from the back of the mountain. From the small parking area, the trail angles up facing a visible summit then crosses a rock fall on the left, before entering the forest.
After a steep, short hike through the forest, scrambles begin.
(3) This part must be the downclimb mentioned on the scrambles book.
(1) We had a little bit of second thought taking this steep, snowy/icy route. But we were very close to the top so we did it.
(2) Sitting on the highest point of Canmore.
(3) Looking towards the Middle Sister
and the Little Sister.
Although in this photo, it looks like it is possible to get on the Middle Sister as well from the top of the Big Sister, not only that it sounds wrong but it is also not doable... perhaps with a rope - That sounded even worse.