...the 5 year old is rough even when he had a pet bunny he used to throw it around by the tail
I think you have your answer right in that line. He doesn't know any better yet. Don't allow him handling privileges until he
does. Better to err on the side of caution in this case.
Ya but that was around a 1 year and 8 months ago
The answer to your question is, "If you even have to come online to a forum and as this question, that means that you already know the answer".
Birds are extremely fragile, extremely. And if you EVEN HAVE A DOUBT ABOUT ANYONE HANDLING YOUR BIRD, then the answer is that you already know that he shouldn't be handling it, AS IT'S NOT WORTH THE RISK!
If he were to come into your room, open the cage up, grab your cockatiel, and EVEN ONCE, ONE TIME, toss, throw, drop, or bang the bird off of anything, whether on-purpose or accidentally, the bird can and probably will die, even with a very, very expensive Avian Vet bill. THERE ARE NO TAKE-BACKS OR RE-DO'S WHEN IT COMES TO THIS, IT ONLY TAKES ONE MISTAKE, ONE ACCIDENT, OR ONE TANTRUM/YOUNG CHILD BEING A YOUNG CHILD TO INSTANTLY KILL YOUR BIRD!!!
And you're talking about a little cockatiel (not that it matters what species of parrot at all, none should EVER be subjected to even the RISK of this happening), they can be killed instantly by simply flying into one window or wall. And you're talking about a now-6 and a half year old child who has a habit of handling animals roughly already.
****Here's my question...You're only 13, why is this your responsibility? Where are the adults in the house who would most likely be buying you the parrot, or at least the ones who would have to say you're allowed to get one in the first place? Why aren't they/weren't they addressing the issue with the bunny rabbit? Why was a 5 year old allowed to do such a thing to an animal?
This shouldn't be on your shoulders, if there is any risk of a child in your home hurting/killing a potential pet, then there shouldn't be any pets until he's old enough to understand what he's doing is cruel, abusive, and wrong. OR you need to have a lock on your bedroom door that opens with a key from outside of the room so he can't get into the room, which I doubt will happen with a 13-year-old's bedroom...