Winston Churchill punika keturunan saking kuluwarga Churchill sepindhah ingkang dipuntepangi kanthi wiyar, John Churchill, Duke Marlborough sepindhah. Bapanipun Winston, Lord Randolph Churchill, punika tokoh pulitik ingkang ugi wujud putra angka tiga saking John Spencer-Churchill, Duke Marlborough kaping 7. Ibu Winston punika Lady Randolph Churchill (Jennie Jerome), putrinipun jutawan Amérika Leonard Jerome.