Gilbert Basset
Gilbert was born before 1238.  He died on July 31st, 1241 in Wycombe.

 Isabel de Ferrers
Isabel was born in 1226 in Derbyshire, England.  She died at the age of 34 on November 11th, 1260 in Austria-Hungary.¹ 

 Son Basset
Son was born before 1241.