Should I try and contact my birth family?

Hello everyone, I am writing to ask for some input, possibly some input from birth mothers who were located by their children whom they put up for adoption. I have been searching off and on for ten+ years. I received non-identifying info when I was about 18 years old. About 7 years ago I reapplied for the information and added my name to my provincial post-adoption registry (Alberta, Canada). The law in Alberta recently changed, allowing the release of identifying names of birth parents. Without going into it too much, of course it was exciting and anxious to read my Mom's own story of why she was agreeing to give me up. They blocked out names of grandparents, and Dad on most forms, though one form did have my Mom's declaration of whom the father was. Just a story about my search, so I can give some advice to those who are searching, I referenced the address she had with some diretory searches I had done earlier in my search, and my conclusion of whom I believed my grandparents were. I was completely wrong. Here's how it went: My adoption info said my Mom's dad was a janitory and her Mom was a sales clerk at a retail store. I made a guess that my Mom might have named me after her father, given that I was born in 1970, and a teenage pregnancy might not have been welcome by her Dad. So I found a John Campbell (My birth name was Michael Jonathan Campbell) who was a caretaker at an elementary school, and it listed his wife as a part-time sales clerk at a dept. store. I was convinced this was him. No such luck. My Mom's info listed her street address, and when I cross-referenced it with the directories, I found that my grandfather's name was Kenneth Campbell. I went a little further, and I find that K. Campbell still lives at the same address in Calgary, the city where I was born. So I can probably say for certain that this is my grandfather. I still have not found my birthmom, but I could probably write to her through that address. Here are my concerns. I have been listed with the post-adoption registry for some time now, and as well on my websites. My mom has never searched for me. I checked the paper classifieds for every year since my birth around my birthday, and there's been no ad looking for me. I figure she's not looking for me, and perhaps doesn't want to look for me. Which then leads me to conclude that she doesn't want to be found. I am worried that contacting her will just disturb her life. She says in the adoption papers that not too many people know about me, so perhaps she tried to keep it that way. I don't know what to do. Also, perhaps she is not alive, and writing to her at that address will cause grief to my "grandfather". Anyone have any ideas? I am excited, but concerned at causing more grief than my satisifaction is worth. Cory