I think it depends on the specific situation. If your aunt is fashionable, you can give her beautiful ornaments or fashionable scarves. If you are knowledgeable, you can send books. You can choose according to your aunt's hobbies. Just use your heart. You can also send shell chandeliers, aromatherapy air humidifiers and other household items, which are very practical in winter. Of course, it is ok to send two movie tickets to my aunt and uncle for a happy Christmas.
PS: It seems inappropriate to give my uncle a lighter. Usually I give my boyfriend a lighter (hehe, I don't know what to give my uncle). Elders should be omnipotent.