Parents need their children to sign the loan because their parents are older and less qualified, so they need their children to sign the guarantee and sign the guarantee contract, so that they can agree to their parents' loan application. However, it depends on the situation that parents need their children to sign the loan. If the parents' own qualifications meet the loan conditions, then there is no need for children to guarantee or sign.
However, if parents borrow money and their children sign it, it doesn't mean they have to bear the responsibility. Only after signing the guarantee contract, they need to bear the responsibility. After signing the guarantee contract, if the parents are unable to repay the loan, they need their children to help them repay.