How should I make contact with my maternal biological grandmother? Read specifically the details before judgin?

Please be sensitive toward this woman who may have given up her daughter under difficult cirstances. Being pregnant out of wedlock was a huge scandal in those days and she may not want her current children to know that she gave up a child. It isn't just about what you want. You may be curious about her and her husband, your biological grandfather, but your real grandparents are the "MOST wonderful couple" who loved and raised your mother as their own.