My Grey of 17 years loved ONLY my husband she has his voice would crawl into bed with him and take naps with him on his pillow next to his head and now for some reason she Hates him, she will attack him if he get too close to the cage and I mean she draws blood big time. She tells me she loves me all of the time gives me kisses and is totally my bird.......WHY?......Who knows. I can tell you, you can't except things to change overnight it will take time. Go to http://www.goodbirdinc.com and sign up for the on-line magazine, there are DVDs and lots of good training available there. Talk softly and go very slow with the bird give him time to adjust.
There is also alot of very good advice right here on the forum, don't give up just yet you may be passing up an opportunity to have a great relationship with this little guy.