 In addition to Jerry having a sister who is only being mentioned  once, George has a brother who is mentioned only twice in the  series: "The Suicide" (his brother impregnated a woman named  Pauline) and "The Parking Space" (Georges father, mother and  brother never pay for parking). Elaine has a sister, Gail, who she  visits in St. Louis, and who she calls after she sends Gails son  her exposed nipple Christmas card. Elaine also mentions a  brother