Geoffroy VII De Chateaubriand
Geoffroy VII De was born in 1293.  He died at the age of 33 in 1326.

 Jeanne De Belleville-Montagu
Jeanne De was born about 1296.  She died in 1359.

 Geoffroy VIII De Chateaubriand
Geoffroy VIII De was born in 1314.  He died  due to killed. at the age of 33 on June 20th, 1347 in La Roche Derrien (without issue).

 Louise De Chateaubriand
Louise De was born about 1318.  She died in 1383 in (without issue).