Weaver (Laura Innes) tries to determine if elderly terminal patient Kathy Brennan (Connie Sawyer) is really her long-lost biological mother. In other developments, Carol (Julianna Margulies) wonders if she should keep her baby. And in his efforts to apply for chief residency, Carter (Noah Wyle) takes over Greene's 24-hour shift while Greene is off trying to prevent the deportation of Nigerian janitor Mobalage (Djimon Hounsou). ~ Hal Erickson, Rovi