John Chrysostom

"Is this your son?" (and they said not, "who once was blind," but) "of whom ye say that he was born blind?" As if they were acting deceitfully, and plotting on behalf of Christ. O ye accursed, utterly accursed! What father would choose to invent such falsehoods against his child? For they almost say, "Whom ye have made out blind, and not only so, but have spread abroad the report everywhere." "How then doth he now see?" O folly! …

Homily on the Gospel of John 58 ↗

Theophylact of Ohrid

They do not say "is this your son, who was once blind," but rather "of whom you say," as if speaking thus: "whom you made out to be blind and spread the rumor of this everywhere, entirely fabricated and false." But, O impious Pharisees! What father would allow himself to lie so about his own child? They press them from two sides and compel them to renounce their son: on one side with the expression "of whom you speak," and on the other with the question "how does he now see?" Do you see? …

Commentary on John ↗

Thomas Aquinas

1332 The Pharisees now question his parents. Here they ask about three things. First, about their son, saying Is this your son? Secondly, about his blindness; and so they add, who you say was born blind. They did not say, "who at one time was blind," but who you say, implying that they made this up. What father would lie in such a way about his son? Yet they were trying to make him say he did. Thirdly, they ask how he had obtained his sight, How then does he now see? …

Commentary on John ↗

Bonaventure

And they asked them, saying. Here is touched upon the diligence of the Jews in inquiring: for they ask the parents three things: the person, the condition, and the wondrous change. For this reason it is said: Is this your son? They ask about the person. Whom you say was born blind? That is, about whom you say that he was born blind; they ask interrogatively about the condition. How then does he now see? …

Commentary on John, Chapter 9 ↗