Aunt Em (real name Emily) is a fictional character created by American author L. Frank Baum and apperars in many of the Oz books. She is the aunt of Dorothy Gale and wife of Uncle Henry who is hardworking farmer. She lives together with them on a very small and isolated farm in the midst of the sun baked prairies of early 1900's Kansas. In The Wonderful Wizard of Oz (1900), she is described as having been a "young, pretty wife" when she arrived at Uncle Henry's farm, but having been "greyed" by her life there, implying that she appears older than one might expect from her chronological age. Baum tells us that when Dorothy first came to live with her, Em would "scream and press her hand upon her heart" when startled by Dorothy's merry laughter, and she appears rather emotionally distant to the child at the beginning of the story. However, after Dorothy is restored to her at the very end of the book, we see her true nature: she cries out, "My darling child!" and covers her niece with kisses.
There is no question about Dorothy's love for her aunt. Indeed, after knocking her heels together three times, Dorothy's request to the charmed Silver Shoes is exactly: "Take me home to Aunt Em! "