Diwali calls for devotion over everything. It's the time to perform pujas to Lakshmi-Ganesha and other deities. So if you send puja accessories and other items of worshipping then your senior relatives will be very much satisfied. Send silver puja items as your Diwali gifts to India.
Send silver puja thalis, roli-tikka dabbi, bell, silver spoon, incense burner etc. with other exclusive Diwali gifts to India.