The relative card is a function of WeChat, similar to the bank subsidiary card. It can be used to open a "relative card" for family members (parents or children) and set their own monthly limit. When family members buy online, they can choose to automatically deduct money from the account of the account holder.
WeChat relatives card is similar to Alipay's intimate payment, but WeChat relatives card can only be bound to one payment method: change, credit card or debit card.
If it is bound with change or debit card, as long as the account has money, anyone who supports WeChat payment can buy it; But if it's a credit card, then you can only buy things that support credit card payment.