Answer: They are sisters.
Dottie (played by Geena Davis) and Kit, (played by Lori Petty), are the main characters of the 1992 film, "A League of Their Own". Dottie is the older sister, who can do no wrong in the eyes of her parents, while her younger sister, Kit, seems unable to do anything right. As with most siblings, the pair bicker, but after Dottie fails to take Kit's side during an important match, they have a nasty argument, which eventually results in Kit being transferred to the Racine Belles.