Who were the children of the legendary Garth Greenhand, the High King of the First Men in the series A Song of Ice and Fire?

Garth the Gardener, John the Oak, Gilbert of the Vines, Brandon of the Bloody Blade, Foss the Archer, Owen Oakenshield, Harlon the Hunter, Herndon of the Horn, Bors the Breaker, Florys the Fox, Maris the Maid, Rose of the Red Lake, Ellyn Ever Sweet, Rowan Gold-Tree