Confusing problem with baby Quaker

I got this 2 month old baby Quaker, male, that was weened off of hand-feeding from my brother's friend who owns several pet shops in a flea market. She gave me all the supplies and the bird for free on Saturday. I fell in love with the bird, and everything has been going smoothly until just recently.
I found out about why he has been rubbing his beak all over the place, he was very anxious and scared, due to my brother bothering him, and probably a new environment. After that incident, he has let me pick him up as usual, and learned to climb onto his perch.

Just yesterday, he started this aggressiveness and actually seems to hiss at me even if I place my hand anywhere near the opening of the cage. I was changing his food when he started looking like he was snapping at me, but not going close to my finger. He walks around and stares at me and will seem to growl/make a hissing or some sort of noise, I can tell he is far from happy. Earlier today I offered a small slice of banana, which he wouldn't go near even when I placed it in a small plastic dish in the middle of the cage.

I am not sure whether I should give him back to the person who gave him to me. She did say if for any reason, I could return him, but I am not sure if I should keep trying or just give him back.
It may seem immature or something, but I feel as if he has grown a hatred tords me, and I really am not sure why. I am positively clueless on what to do. Everytime I open the cage door, he crawls into his hiding place, a triangular cave-like toy that is used for sleeping. I wouldn't want to remove him from his safe-place cuz I don't want him to feel unsafe in there, or "hate" me even more and trust me even less, so I honestly do not know what to do for him if he won't even let me pick him up, really.

I would really love any suggestion, so thank you in advanced =/

Fufu,
Relax...
Take a deep breath and gather your patience.

First, protect that baby.
Keep your brother away from it if he can't be nice!


Then take it one day at a time...Parrots are VERY smart...If the baby has been frightened, it will take time for him to calm down and feel safe again...He will not quickly forget that he was frightened!
Make things as quiet and calm for him as possible...You will need to show him that you are his "mommy!" and you need to nurture him. Talk softly to him...Don't move too quickly around his cage. Go slow and steady.


Take care of his basic needs--fresh water, healthy food, safe and clean environment, and love and comforting if he needs it.
You just have the "new birdie worries" but it sounds like you are a caring person so RELAX....You're doing fine...

Keep us posted.

Time, time and more time ... imagine a human child, uprooted and moved to a whole new home and family with no choice or voice in the matter. Allow the bird time to trust you and learn that you don't mean it any harm. Good luck!

Indeed, all you really need to do is make an effort. The thing I always tell people is to treat your bird like you would a young child, puppy, or kitten.

Take him with you to the couch, let him sit on your lap while you watch TV. Bond with him.

Too often people treat their birds like a piece of furniture; they just sit in their cage in the corner - you can enjoy looking at them and listening to their funny noises. Just like people, birds need more stimulation!