I looked into the legitimate descent of Hugh. here is what wiki says: Hugh married Ermentrude of Claremont, by whom he had one son, Richard, who succeeded him. Richard married Matilda of Blois, daughter of Stephen, Count of Blois and Adela, a daughter of William the Conqueror. Both Richard and Matilda died in the White Ship disaster (1120), and Hugh was then succeeded by his nephew Ranulph le Meschin, Earl of Chester. Hugh was buried beneath the stained glass windows in the Chapter House of Chester Cathedral.
=== Ranulf, however, was nephew via Hugh's sister, not his brother. So it seems that, unless we get an illegitimate son's descent,we're stuck there. The main line of the Langtons is down to a female now, also. (Lady Diana may have male relatives, though) There would be descendants in the male line on junior branches, but I don't know any personally. I'm descended from an Ann Langton, so I'm out. Rex found a problem in his descent, which must be in the female line, but he thought he had some other Langton lines on his tree.