This suggests that everyone has a lot more learning to do.
Firstly, everything they do in the presence of the parrot is, in some way, interaction and will shape their relationship with the parrot. Making eye contact is interaction. Swapping bowls out, if the parrot is in the room, is interaction. Talking, singing or shouting in the same room as the parrot is interaction. Responding to - or ignoring - sounds, whistles, chirps, squawks and screams is interaction. There are many, many ways of interacting with a hands-off bird.
Secondly, birds don't really care who interacts with them the most when deciding who their favourites are. An even cursory look through this forum will find many posts along the lines of "I am the only who does all the daily care for my bird, interacts with them, plays with them and yet my bird only wants to be around my partner".
I had many pets as a child - dogs, rabbits, guinea pigs, gerbils, rats and stick insects. I got and trained my first dog from a puppy when I was 14. However, my parents were 100% behind me, paid for everything including vet fees, and when I went to university, they looked after my dog for the rest of her life. I had a lot of responsibility but I also had a lot of support. I think that 13 year olds can care for animals wonderfully - however, it is important to recognise the limitations of a young teenager.
Being a teenager is a time-limited condition. Most small mammals can live their entire lives during someone's teen years. This isn't the case with a bird which why I think they make such unsuitable pets for teenagers. Even if someone doesn't attend university, they're not going to live at their parents' house and be financially dependent on their parents for the rest of their life. It's essential to consider the implications of a 13 year old taking on the care of an animal that can live for three decades.