FlyingBailey

Hello guys, My dad has had a 10 year old grey (Bailey) for a month now. He will eat from our hands but will not step up or be touched. My dad noticed him splashing about in his drinking water so decided to get a bath. My dad proceeds to get a small shiny metal bathtub and attaches it to the bottom of his cage, he then goes for a nap smh. I come into the room about 10 minutes later, Bailey's pupils were very small and he was stood very still on the edge of his open-top cage perch in the corner (I'm not an expert but he looked petrified). I assumed that something was wrong so put my hand out and called his name expecting him to shuffle away as he normally does, he didn't move and let me touch his tail so I moved my hand back quickly to see what was wrong as this was VERY different behaviour. I immediately moved the metal bath to another room and after a brief search for the bath he was back to normal. Not just back to normal, he now puts his head down when I put my hand near it waiting to be petted and stroked! When my dad puts his hand near he lunges viciously. I want him to stop liking me and start liking my dad, how do I reverse our roles. Do I have to avoid Bailey?