One of the basic conditions to apply for a card is "at least 18 to 70 years old, with full capacity for civil conduct". If this person does not have full capacity for civil conduct due to mental illness, but has applied for a credit card, his family can take the initiative to contact the bank to provide relevant certificates and apply for cancellation of his credit card. If he has full capacity for civil conduct and repayment ability, others cannot interfere with his application or use of credit cards.