House Umber appears to be the most northern of the houses of Winterfell, with Last Hearth beyond the Last River and not very far from Eastwatch-by-the-Sea on the Bay of Seals. Jon Umber, called the Greatjon, is its lord, with his son and heir, also Jon, called the Smalljon. Lord Umber’s uncles, Mors Crowfood and Hother Whoresbane, aid him in ruling Last Hearth.
Information about House Umber that reveals spoilers from the books.