He succeeded to his father's counties of Aumale and Harcourt and barony of Elbeuf on his execution in 1356

In 1359 John married Catharina (1342-1427), daughter of Peter I, Duke of Bourbon. They had the following children:

Charles (1366-1384)

John VII (1370-1452)

Louis (1382-1422), viscount of Châtellerault and lord of Aarschot in Mézières, archbishop of Rouen

Blanche (-1431), abbess of Fontevraut

Isabella (1371-1443), in 1383 married Humbert VI of Thoire en Villars

Johanna (1372-1456), wife of Montaigle, in 1393 married William II of Namur

Maria,in 1405 married Renaud IV of Gueldre (-1423) and in 1416 married Robert (-1431), son of Adolf of Gulik-Berg

Catharina, non

Margaretha (1378-), wife of Longueville and of Plaines, married John II lord of Estouteville,

Johanna, non.