Quintilian Institutio Oratoria 11.1.83

[83] He will say that it is the prayer of all parents that their sons should be better men than themselves (for example, if a daughter also had been born to him, the harlot, her mother, would have wished her to be chaste), or that he himself was in a humbler position (for a man in such a position is permitted to marry a harlot), ¹ or that he had no father to warn him; and further that there was an additional reason against his son's conduct, namely, that he should not revive the old family scandal nor reproach his father with his marriage and his mother with the hard necessity of her former life, nor give a bad example to his own children in their turn. We may also plausibly suggest that there is some particularly shameful feature in the character of the harlot married by the son, which the father cannot under existing circumstances tolerate. There are other possible arguments which I pass by: for I am not now engaged in declamation, but am merely pointing out that there are occasions when the speaker may turn his own drawbacks to good account.