Karen Cooke's(maiden) sister

I was born in Foothills hospital in Mar. of '75. My birth mother is Edited per users request(maiden name) I know she has a sister living in Alberta somewhere. They both originally are from Manitoba, and I believe Edited per users request lives in Manitoba w/ her family now. We've had one contact on the phone and she wrote me a letter. I can only contact her through my search agent. But, I want to find her sister and talk to her.