I am looking for birth relatives of my birth mother

I have been searching for my birthmother and found out she died 5 years ago from breast cancer. She would have been about 60 years old when she died. I was diagnosed with early stage breast cancer 5 years ago. I have 2 daughters and one granddaughter. I am upset that I did not search earlier and would like to find any relatives. I was told she had 2 children. She also had one sister and two brothers one of which is deceased. I was born 6-29-1954 in Milwaukee and was adopted Sept 1954. Please help me locate any family