To Contact or Not to Contact

Hello to everyone This is my first time posting in this forum (or anywhere for that matter). I want advice on whether to contact my birth mother or sibiling directly. I will tell you the background. I was adopted in Canada as a newborn in 1966. I found out about my adoption about ten years ago when my adopted mother died looking into some her papers. Recently, I contacted the Adoption agency in Quebec (Closed Adoption System) and was given basic Non identifying information about my birth family. I was surprised to know that my birth parents, got married after my adoption and later on had two additional children who are well. I decided to use the adoption agency and contact them. However, my mother (my father died) told the agency that she did not want to have any contact with me, and did not want any identifying information shared. She also said that she could not confront her children with the news that she had given up their older brother for adoption. She also mentioned that it was my father, who had died, that may have been interested in knowing more about me, but since he died she did not want to look back. I would normally respect her wish and would not have gone further. But curiosity and unanswered questions made me look into my background and on my own was able to research and find out the identify of my mother and my brother and sister. In fact, I know who they are in facebook and have seen some pictures of my nephews. Now my question. Should I force the issue and contact them directly. I know I should NOT, but knowing their identity is tempting. Actually, now that I am experiencing this, I understand the purpose of closed systems. Knowing the identity of my birth family is worse than not knowing. What do you think? Appreciative. Jorge