Hello, regarding credit card signatures, signatures are very necessary. Although signatures seem to be optional in China. When making general POS purchases, the cashier rarely checks whether the signature on the back of the credit card and the signature on the bill are from the same person. Of course, it is not ruled out that someone will check. If you do not sign, the cashier will ask You present relevant proof, such as ID card. Therefore, in order to avoid unnecessary trouble, please sign your name personally. In addition, it is not recommended to lend a credit card to others. Although there is no law prohibiting you from borrowing a credit card, the bank has relevant regulations. If you borrow a credit card, Any risks associated with your credit card are entirely your own responsibility. Therefore, if you want your family to use your credit card, it is better to go to the bank to apply for an additional card. In this way, your family can also use the limit of your credit card. In addition, you can also specify the limit of the additional card yourself (cannot be higher than the limit of the main card). Hope my answer can help you.