During a meeting of Ironrath's small council, Lord Rodrik Forrester may ask about summoning House Forrester's allies. Duncan Tuttle responds that House Brownbarrow, along with Houses Grayson and Elliver, were wiped out at the Red Wedding.
In the books
Unlike the Forresters and Whitehills, House Brownbarrow seems to be purely an invention of Telltale, much like Houses Branfield and Glenmore. The same is true for their allies, Houses Grayson and Elliver.
Houses from the North