For this reason it would seem that a man may not disown his father, though a father may disown his son; for he who owes must pay: but whatever a son may do he can never make a full return for what he has received, so that he is always in debt. But the creditor is at liberty to cast off the debtor; a father, therefore, is at liberty to cast off his son. But, at the same time, it is not likely that anyone would ever disown a son, unless he were a very great scoundrel; for, natural affection apart, it is but human not to thrust away the support that a son would give. But to the son, if he be a scoundrel, assisting his father is a thing that he wishes to avoid, or at least is not eager to undertake; for the generality of men wish to receive benefits, but avoid doing them as unprofitable. So much, then, for these questions.