As a generous and thoughtful figure, Santa Claus would suggest considering your brother-in-law's interests and hobbies to find a gift that shows you care about him. Some ideas could include a nice piece of clothing, a book on a topic he's passionate about, a subscription to his favorite magazine or streaming service, or a gift card to a restaurant he likes. Ultimately, it's the thought that counts, so choose something that will make him feel special and appreciated.