The father's loan belongs to the father's personal debt and has nothing to do with his children and other relatives. The father is responsible for repayment, which has nothing to do with the household registration book. If the other party files a civil lawsuit and obtains an effective judgment, and your father still fails to repay the debt, the other party will apply for enforcement next. If property clues are found, they will be provided to the executive judge, including houses, vehicles, bank deposits, provident funds and so on. If your father no longer has any property, the other party can apply to list him as an executor of bad faith. But these are all borne by your father, not your children.