So what he has started doing is whenever my sister comes near his cage, he will start singing tunes for her and stop singing as soon as she is a meter apart and just stare at her to come close when she does come close to try to pet him or something he will repetedly bang his beak on either the cage or her finger/hand even trying the bite her (not sure if he knows how to properly bite but he tries) and as soon as she puts her finger away he starts singing again looking at her. He never lets her pet him, even though he lets everyone else. He doesn't do this to anyone else (as he does sing for other people but never tries to bite or bang his beak often demands pets from me and my other siblings and me. Why is he doing this? because normally he is such a sweetheart (i tried to take a video of him doing this but bro keeps getting distracted by the phone)