I handfed my cockatiel since he was 15 days and we were good all the time he loved to play and he comes to me when I call him but from 2 months my bird started to ignore my calls and running away from my hand when i try to pet him amd he is stealing the treat from my hand and run away. He started flying to my sister everytime he sees her and i posted a thread that he ignore me but know i knew that he lost trust of me cause from 2 months I tried to teach him to lay on his back and got him a harness. I did introduce the harness step by step and the trick too but he hated them and that made him to hate me too so any suggestions to make a bond again?