Sir John du Plessis
Sir John was born about 1206 in Arundel Castle, Sussex, England.  He died in Hook Norton, Oxfordshire, England.

 Christina de Sanford
Christina was born about 1211 in North Moreton, Berkshire, England.  She died on December 25th, 1242.

 Sir Hugh du Plessis
Sir Hugh was born about 1236 in Arundel Castle, Sussex, England.  He died on July 7th, 1292.