Osbern Giffard (Lord Brimsfield)

Osbern was born in 1020.  Osbern's father was Osborne de Bolbec (Lord of Longueville) and his mother was Avelina de Crepon.  His maternal grandfather was ??? from Pays de Caux. He had a brother and a sister, named Walter and ???.  He was the youngest of the three children.  He died at the age of 65 in 1085.