User blog comment:EpsilonMk46/Lincoln the Butt Monkey?/@comment-28517097-20170902055552/@comment-32202721-20170902222331

Also, while you could argue that Lincoln is the most important character (since he's the lead), in-universe he is not any more or less valuable than any of his sisters. Every member of the family is equally loved and valued because that's how loving families work.