Roger II De Mowbray
Roger II was born in 1254.  He died at the age of 42 in 1296.

 Roese De Clare
Roese was born on October 17th, 1252.  She died at the age of 64 in 1316.

 Christinia De Mowbray
Christinia was born in 1285.

 John I De Mowbray
John I was born on September 4th, 1286.  He died at the age of 34 on March 23rd, 1321.