Quoting Milk Monster:" I don't understand why people seem to think she'd have to tell the other two that she aborted one if that is what she decides to do. It's none of their business and she doesn't have to tell them."
My mother was pregnant three times before me, all were aborted for reasons I'm not too sure about. I didn't know until we were meeting with a family counselor and it was required for her to give this as essential information, my being present was pretty much the only reason I found out. =/
I honestly don't know if I would have wanted to know, I guess I can see reasons why someone in my shoes may want to. And reasons as to why those abortions were probably best for my mother to keep to herself..
Just giving a possibly relevant input.