Young enough to run where he pleases, small enough to be overlooked — not forever.
Too young to remember much of his uncle. Hewyl is one of Cerys's two children, age 9 — named alongside his older sister Wini (12) in the example that establishes Cerys as Garet's widowed sister.
GM notes
Garet had sister: Cerys (widow, kids Wini & Hewyl, 12 and 9).