Legal subjectivity:

It also depends on how old the son is. If the son is a minor, the father should repay the debt for him because the father is his legal guardian. If the child has reached adulthood, the father does not have to pay off the son's debt. Legal objectivity:

Article 27 of the Civil Code: Parents are the guardians of their minor children. If the minor's parents have died or have no guardianship capacity, the following persons with guardianship capacity shall serve as guardians in order: (1) Grandparents; (2) Brother or sister; (3) Other individuals who are willing to serve as guardians or Organization, but must obtain the consent of the residents' committee, village committee or civil affairs department of the minor's residence.