The only certain members of the house to appear or be mentioned are Lord Vance and his heir Ser Karyl. Other Vances, such as Ser Dafyn Vance and his children by Maegelle, one Lord Frey’s grand-daughter, are of an unclear branch.
Ser Karyl and Ser Marq Piper took smallfolk who had been attacked by Ser Gregor Clegane to the Red Keep, to be heard out by the Hand while their fathers were ordered by Lord Hoster to build up their strength beneath the Golden Tooth. The Hand ordered a troop under the command of Lord Beric Dondarrion to arrest and execute the Mountain, but they were not successful at this. Lord Vance was slain in battle beneath the Golden Tooth, the riverland host being smashed asunder by the Kingslayer and his army.
Lord Vance’s son inherited the lordship, and Lord Karyl has since won some small victories against the Lannisters in the riverlands. At least one Lord Vance has been pardoned after the Red Wedding, where at least one of the Vance brothers was wounded or killed during the fighting.