Beza's father had two brothers; Nicholas, who was member of Parliament at Paris; and Claude, who was abbot of the Cistercian monastery Froimont in the diocese of Beauvais.
Tatăl lui Beza avea doi frați: Nicholas, membrul al Parlamentului de la Paris, și Claude, abate la mănăstirea cisterciană Froimont în dioceza Beauvais.