Roose is the son of Rodrik Ryswell.
Recent Events: Along with the rest of House Ryswell, Roose attends the wedding of Ramsay to "Arya Stark" (actually Jeyne Poole) in Winterfell. Lord Roose Bolton mentions to Theon Greyjoy that Roose Ryswell is his namesake.
Roose Ryswell sends scouts out the Hunter's Gate of Winterfell to locate the army of Stannis Baratheon in the wolfswood, but none have returned yet.
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Westeros Notorious Rulers and Families
FanfictionDuring the history of Westeros many notorious rulers come into power. Maesters have compiled a the histories of all Rulers and their families. Part Two