Isabeau of Bavaria
Antonia's sister, Taddea Visconti married Stephen III, Duke of Bavaria and was mother of Isabeau of Bavaria, wife of Charles VI of France and ancestor to some notable people in history, including the Tudor Dynasty. Another sister, Agnes, married Francesco I Gonzaga and was executed for supposed adultery in 1391. Antonia's youngest sister Elisabetta was married to Ernest, Duke of Bavaria.