Tristan IV had three sons: Robert, the eldest was killed at Agincourt in 1415. The two younger ones, Bertrand and Chretien, followed their father to Sicily in 1409; Chretien stayed there to become the Grand Senechal to the Court of Louis II, the King of Sicily. Bertrand took part in three years of campaigning, culminating in the victory of Roccasecca in 1411, then returned to look after the estates in France. He was Lord of la Grande Jaille, east of Loudun, of Ranton, of Avrille in Anjou; of Beuxes; of La Roche-Talbot in Souvigne-sur-Sarthe; of la Balayere in the Bierne; of La Varenne-Bouzeau near to Moranne and others. He grew up at Ranton and it remained his mother's home until her death.