John de Clifford
John was born before 1254.  He died in 1292.

 Margery Hereward
Margery was born before 1255.  She died after 1270.

 Isabella de Clifford
Isabella was born before 1270.

 Margery de Clifford
Margery was born about 1270.

 Richard de Clifford
Richard was born about 1270.