Torrhen Whitehill

Torrhen Whitehill is the second youngest son of Lord Ludd Whitehill and Lady Whitehill. He has two older brothers, Karl and  Ebbert, a younger brother,  Gryff, and a sister,  Gwyn. Though Torrhen is Ludd's third son, he is first in line to inherit Highpoint due to Karl's death and Ebbert's profession as a maester.

"Sons of Winter"
Torrhen is mentioned by his sister Gwyn to be currently in the company of Roose Bolton after Rodrik Forrester observes the Whitehill family tapestry at Highpoint before treating with Lord Whitehill.