This is a distant relative of mine (and I suppose I am a more distant relative of yours). Interesting story...I'd be curious as to what you know on your end.
I don't think you're looking for banff..I think you're looking for Fort Normandeau (now Red Deer):http://zoominlocal.com/reddeerexpress/2011/03/02/#?article=1...
Contact me for more info...between the two of us we could probably piece together some stuff (if you want to). Heads up: Some of this would have been very sensitive at the time. For me, there is nobody left in my family with emotional attachment to it. I just find it fascinating.