I can only tell you my limited experience. I got a baby TAG, four months old, on September 28th. My husband brought him home from the airport and from the moment he came in the house, I did pretty much everything with him. My husband held back because he knew I wanted this to be my bird and he was concerned it might bond with him. (I was not concerned.) He was able to scratch Neo's head and give him treats. A couple of weeks ago that changed. I'm not sure what did it but I think it was the day that my husband had the other two birds out and was interacting with them. So far those two birds are not part of Neo's "flock". They don't get along...yet. Now if he tries to pet Neo, he gets the ruffled feathers and beak up. He can still give treats and is slowly working to being able to pet him again. I told him he just has to be patient and keep trying to get his hand a little closer.