A fascinating question, to which there's no ready answer that I know of. I doubt that JMB was really aware of the misery Peter endured by virtue of his namesake, and of course Nico was quite happy with the association - probably George too, and Michael I imagine took it in his laconic stride. Of course Barrie was aware of the inevitable Peter Pan association for all 5 boys, and gloriously lampooned it at the time of Nico's marriage in 1926 (in the database search for "Nico wedding" and go to pages 3 and 4 to see the real press cuttings of the event, then search for "Nico spoof" and read Barrie's wonderful send-up) -- but whether he was aware of Peter's hurt is anyone's guess... not that there was much he could have done about it. My guess is that Peter's pride would have prevented him from ever having really let on to Barrie, and I can't think of anyone else who would have told him the truth.