The only Goodbrooks to have been been mentioned so far are a dead Lord Goodbrook and his son, who may or may not be Lord Lymond Goodbrook, and Ser Garse Goodbrook and his children. Ser Garse is married to Kyra of House Frey, one of Lord Walder’s grand-daughters. During Robert’s War, Goodbrook stayed loyal to the Mad King and so Lord Hoster Tully came down on them with fire and sword, burning villages. After the war, Goodbrook’s son, possibly Lord Lymond, made his peace with Lord Hoster and King Robert.
Information about House Goodbrook that reveals spoilers from the books.