When I was in first grade, my best friend was a boy named Daniel. On the day that I learned he was the oldest child in his family, I was shocked, because he was only in first grade. I told Mom, expecting her to be surprised too, but she wasn't. She pointed out that Russell was the oldest in our family, and he used to be in first grade. But I didn't see how that was relevant, because that was in the past and when he was in first grade, I wasn't.