According to this pedigree, this Robert's parents connected here on Geni are his grandparents from their son named Hugh - so a skipped generation here on Geni, if correct:
https://gw.geneanet.org/foullon?lang=en&m=N&nz=foullon&...
This is what they show:
Hugh Osebere De La Hull , De la Hull ca 1154-1224 & Ewyn Dee of Normandy, De Cornwall, De Normandie ca 1155-1187/
Hugh De La Hull , De la Hull ca 1175-ca 1230 & ?
Robert de LA HULLE, De la Hull ca 1199-ca 1255 & Ann lady De Grousse, De Grousse ca 1200-1254
