My sister and I are 10 years apart and used to hate each other. Our dynamic has totally changed over the years.

The author and her sister have gotten much closer over the years. Courtesy of Hayley Folk For a while, I thought I'd be an only child, and I was fine with that. Then, when I was 10, my parents told me I'd soon be a big sister. My sister and I didn't get along when we were young, but our...