The simple solution is giving them a prepaid debit gift card.
When each of your birthday's emerge you have also your gift ready. They will put in the valid , and claim either to never have received the card or which isn't had been used up already. eBay will typically refund consumer. https://Groups.google.com/g/giftcard-mall-my-gift-info/c/lJb4jNQqwjY