 The seventh-season opener is one of farewells for the Ingalls and Olesen families. Nellie and Percy move to New York to run his family s store and hotel upon Mr. Cohen s death. Mrs. Olesen falls into a deep depression which is only abated when she and Nels adopt a little girl named Nancy, an unruly monster who is an exact copy of a young Nellie. Meanwhile, Adam and Mary announce they too are moving to New York so that he can find meaningful work as an attorney.