If imitation is the sincerest form of flattery, my three-year-old really lays it on thick for her big sister. She wears the same clothes, reads the same books, sings the same songs, and even tries to finish her sister’s sentences. I often try to convince my younger kid to think for herself—and she often does—but recently, I stopped myself, realizing how lucky she is to have a kind, compassionate, creative big sibling to walk alongside.