My grandmother had six children. A boy, and then a girl, and then another boy, and then another girl, and then another boy, and then another girl. My dad was the middle boy.
A professor of population studies asked me during a discussion if my grandmother had six children and if my mother had two. I answered yes. Yes and yes. Apparently, Korea had very strict population control and those were the ideal numbers for those days. I was quite dismayed to learn that my family was so typical. The number of cousins and siblings so determined by governmental forces.