{Where is thy Father?} (pou estin ho pat(8872) sou;). "The
testimony of an unseen and unheard witness would not satisfy
them" (Vincent). Bernard understands the Pharisees to see that
Jesus claims God the Father as his second witness and so ask
"where," not "who" he is. Augustine has it: _Patrem Christi
carnaliter acceperunt_, Christ's human father, as if the
Pharisees were "misled perhaps by the Lord's use of anthr(9370)on
(verse  17 )" (Dods). Cyril even took it to be a coarse allusion
to the birth of Jesus as a bastard according to the Talmud.
Perhaps the Pharisees used the question with _double entendre_,
even with all three ideas dancing in their hostile minds. {Ye
would know my Father also} (kai ton patera mou an (8869)deite).
Conclusion of second-class condition determined as unfulfilled
with an and second perfect active of oida used as imperfect
in both condition and conclusion. See this same point made to
Philip in  14:9 . In  14:7  Jesus will use gin(9373)k(935c) in the
condition and oida in the conclusion. The ignorance of the
Pharisees about Jesus proves it and is due to their ignorance of
the Father. See this point more fully stated in  5:36-38  when
Jesus had his previous controversy in Jerusalem. In  7:28  Jesus
said that they knew his home in Nazareth, but he denied then that
they knew the Father who sent him. Jesus will again on this
occasion ( 8:55 ) deny their knowledge of the Father. Later he
will deny their knowledge of the Father and of the Son ( 16:3 ).
The Pharisees are silenced for the moment.