Do you know where my family is?

I am looking for my 1/2 brother and sister, he is Jamie and she is Elizabeth, they would both be in their late 30's or early 40's. Their mom is Wynonna (sp) and their dad goes by the name of "Sandy" but his real name is Alexander, he is/was a long distance truck driver. Our father's mom's name is Joyce. A few years ago Elizabeth was in Edmonton, Ab. she was in the hospital there and met her aunt with the same name. Jamie, Elizabeth and their mom lived in Toronto in the Keele & Sheppard (or Jane and Sheppard) area when they were young. Please help me to find them, if you know who they are please have them read my message so we can make contact. I know that with the internet this is a small world, please help me prove it.

There are some details I have left out that they can verify so please don't waist my time by pretending to be either of them if you are not really them.