20-year-old Corey Seager is a top prospect of the Los Angeles Dodgers, playing in the prestigious Arizona Fall League this year. His oldest brother, Kyle, is currently an All-Star third baseman with the Seattle Mariners. His 22-year-old brother, Justin, also plays professional baseball in the Mariners organization.
Corey attributes his maturity and baseball sense to being able to watch and learn from his older brothers while growing up.
See below link for a story about the Seager brothers from truebluela.com: