Hello, about the signature of credit card, you need to sign it. Although in China, it seems that signature is dispensable. In general POS consumption, cashiers rarely check 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 excluded that someone will check it. If you don't sign, the cashier will ask you to show relevant documents, such as your ID card. So in order to avoid unnecessary trouble, please sign in person. In addition, it is not recommended to lend your credit card to others. Although the law does not prohibit you from lending credit cards, banks have relevant regulations. If you lend a credit card, you will bear all the risks. So, if you want to let your family use your credit card, you might as well go to the bank to apply for a supplementary card, so that your family can also use the amount in your credit card, or you can specify the amount of the supplementary card yourself (not higher than the amount of the main card). I hope my answer can help you.