A.T. Robertson Commentary John 9:19

"and asked them, saying, Is this your son, who ye say was born blind? How then doth he now see?" — John 9:19 (ASV)

Is this your son who ye say was born blind? how doth he now see? (Hουτος εστιν ο υιος υμων, ον υμεις ληγετε οτ τυφλος εγεννηθη; πως ουν βλεπε αρτι; ). It was shrewdly put with three questions in one in order to confuse the parents if possible and give the hostile Pharisees a handle.