Thought this information may help you.
Mosquito Creek Round Up Book
Under The Colemans - Ben Colemand and Lottie George
By the time we moved to Alberta in 1908 there was a family of niine: Jack, Ben, twins Iva and "Doc", Ethel, Esther, Jim, Lottie, and Laura. Donald (Dunc) was born at Stavely. Ethel and Jim died in 1910.
You may be able to find something on the death on this site below in the nanton newspaper.
http://www.ourfutureourpast.ca/Pennie