1. Books: If the brother-in-law likes reading, he can send a book he is interested in, such as his favorite novel, history book, culture book, etc.

2. Electronic products: If your brother-in-law likes technology products, you can consider sending an electronic product, such as a tablet computer and a smart watch.

3. Sporting goods: If the brother-in-law likes sports, he can send some sporting goods, such as basketball, football and golf clubs.