Accept normally. According to the provisions of Article 17 of the Guarantee Law, if the parties agree in the guarantee contract that the debtor needs a guardian's guarantee, the relatives will be given priority, and the guarantor of the sister loan is a brother or sister, which should be accepted normally. However, if the borrower and guarantor fail to repay the loan for a long time after handling the secured loan, it will not only generate high overdue interest, but also affect the personal credit information of the borrower and guarantor.