Ned Umber is the son of Smalljon Umber and grandson of Greatjon Umber. He seems to be named after Eddard Stark, who was also known as Ned Stark. After the death of his father at the Battle of the Bastards, Ned becomes the new lord of House Umber and their castle despite being only ten years old.
Ned is at the council of Northern and Vale lords in Winterfell's main hall held by the new King in the North Jon Snow. Sansa Stark suggests giving the Last Hearth to an ally of Jon Snow, but Jon dismisses this idea, as Ned wasn't to blame for Smalljon Umber's actions. Jon speaks his name and Ned stands up from amongst the other lords, a full head shorter than them and wearing an expression of fear and uncertainty. Jon then motions for him and Alys Karstark to walk forward and stand before him; fearing that he will have them executed, Ned and Alys obey. However, Jon does not show any desire to punish them for their fathers' actions and instead asks them to once more swear fealty to House Stark. Visibly relieved, Alys and Ned draw their swords, kneel before Jon and declare they will serve House Stark "now and always", retaining his position as Lord of Last Hearth.
Ned is also present when Jon announces his plans to leave for Dragonstone, to make an alliance with Daenerys Targaryen in order to defeat the Night King, and leave Sansa in control of the North.
The 10-year-old son of Smalljon Umber, Ned bends the knee to Jon Snow to demonstrate his family’s loyalty, and in return he is granted his family’s ancestral home of the Last Hearth.