Parrots are intelligent and aware enough to have definite opinions on things. Example, my little Amazon Salty absolutely hates having anyone touch him under his wings, just like your sunnny. He likes certain people and hates others, that very common with parrots, especially if they were not socialized early in their life. SOme parrots are more curious and outgoing, and some are nervous and take more time to get them comfortable with new things. Very much depends on the individual parrot. They are each their own bird, so to speak. But most do respond to patient, loving and careful training and work with people. Emphasis on the patient. Do you or the family spend one on one time with him? That is so important with parrots, they really are social creatures. They gave access to a wide array of feelings and emotions, much the same as humans do, it is really amazing but very true.
And they can be a little nuts too. Speaking of being fearful, I will relate a little story. Salty (my parrot) and I train to do tricks almost every single night. He is 7 years old now so easily over a 1000 training sessions ( likely much more) and we use a lot of props in these tricks. Occasionally, he will act like a given prop, say a ball or a little bird figurine is kryptonite and he is all fearful, getting thin and running away to the far corner of the table, even though he has seen and worked with the prop many many times. And then the next night he's fine with it. No idea why. Like I said , a little nuts.