It is not illegal to open an account in Hong Kong instead of relatives. It is not illegal to open an account in Hong Kong instead of relatives, but according to the regulations of the Hong Kong Securities Regulatory Commission, Hong Kong securities companies must make sure that customers are real customers and are suitable for having securities accounts. Therefore, if you open an account in Hong Kong instead of your relatives and provide false information, it may be suspected of fraud or other related legal issues, which is illegal. I suggest you carefully understand the relevant laws and regulations in Hong Kong and consult professionals.