As explained in other comments[1], being the eldest sibling wasn't the default answer to a question. Instead, people were asked to enter into a text field their

As explained in other comments[1], being the eldest sibling wasn't the default answer to a question. Instead, people were asked to enter into a text field their number of older brothers, older sisters, younger brothers, younger sisters. [1] https://news.ycombinator.com/item?id=16105462 https://news.ycombinator.com/item?id=16105462