My relatives lent me a credit card and owed me 5800 when I returned it. How should I sue him? There are no IOUs, but there are records of recording when I borrow my card and chatting when I ask for money. Admit it, talk to him privately, ask for money back, or find an elder to solve it.

You can't borrow a credit card. If you sue, your loss may be even greater. May be listed as an untrustworthy group.

Credit cards and their accounts are only used by cardholders approved by the issuing bank and may not be provided, rented or lent to others. It is a crime of obstructing credit card management. Therefore, your credit card cannot be lent to others, and the credit card must be held by the person in charge and cannot be lent to others. Lending to others is generally a violation of the use contract. It's not illegal, but it violates your contract with the bank. If you bear any responsibility for the third party caused by your card borrowing, the bank will not bear any responsibility.