Robin died last year (12) after a battle with cancer, and his relatives are planning to host a service of remembrance in his honour at London's St. Paul's Cathedral later this year (13).
However, Barry is adamant he will not fly back from his home in Florida to attend the memorial.
He tells Britain's Daily Mail, "No, I can't do that (attend the service), because for me the grieving is over. It would throw me back into that dark place again... (I will leave it to Robin's close family)... or whoever really feels they have to do that...
"Robin is always with me. I don't need to stand in a church or be in some place where there's a ritual."