It will not affect the child's loan to buy a car. According to the information of China People's Congress Network, Article 391 of the Civil Law of People's Republic of China (PRC) stipulates that the guarantee responsibility belongs to the civil performance responsibility, which will be borne by the civil actor and will not have any influence on the children. If a third party provides a guarantee and the creditor allows the debtor to transfer all or part of the debt without its written consent, the guarantor will no longer bear the corresponding guarantee liability.