There is no single "best" gift for a big brother - it depends on his interests, personality, and relationship with his little brother or sister. However, some thoughtful and practical gifts that big brothers might appreciate include a new tool set to help him with his hobbies, a gift card to his favorite store, or a nice watch. If your brother is particularly close to his little sister or brother, he might appreciate a gift that helps him bond with them, like a new set of Legos or a interesting book. Whatever you choose, make sure it's something your big brother will appreciate and use.