Every woman without children needs an arsenal of reasons to defend that decision. People with children want to know "why not," especially the ones who never asked themselves "why."
I have plenty of reasons, but now that my brother Dave's gone I realize I have more. He required a lot of emotional care, and of course financial care. However, now I realize that while the financial responsibility was only for the last fourteen years, the emotional maintenance has been since I was born.
Add that to the responsibilities I had as the only physically healthy one in the family, and though I don't feel like it equals the responsibility of even one child, I didn't sign up for it. So I'm not inclined to re-live it again.
I still miss him at times, like when there is breaking news, or space news. It's like a whole new world now. I'm like an empty-nester; no idea what to do with all this time and peace.