When he looks at me, he sees the one who sent me.
“sees” = theoreo = to behold, perceive, or consider. He who steadily considers the Son does so also with the Father (#1:18, 13:20, 14:9).
John 1:18 No-one has ever seen God, but God the One and Only, who is at the Father’s side, has made him known.
John 13:20 I tell you the truth, whoever accepts anyone I send accepts me; and whoever accepts me accepts the one who sent me.”
John 14:9 Jesus answered: “Don’t you know me, Philip, even after I have been among you such a long time? Anyone who has seen me has seen the Father. How can you say, ‘Show us the Father’?