In 1154 he married Beatrix de Gernons, daughter of Ranulf de Gernon, Earl of Chester. They had at least one son born around 1156. The name of his son is unknown (possibly Einion de Tilston born @1156 ref: Geneanet.org).
Beatrix de Gernons was a sister of Hugh of Kevelioc, and a great-granddaughter of Henry I Beauclerc, son of William The Conqueror and Matilda of Flanders. Great-great-great-great-granddaughter of Richard III De Normandie (Grandfather of William the Conqueror)