I have two beautiful two months old cockatiels that I helped their parents raise by hand feeding them with the parents daily. I didn't spend much time with them after hand feeding, not more than 1-2 minutes in my hand talking to them. they step up when I push my finger against their chest they ate a bit of millet from my hands, but they are scared and get away from my hands sometimes. when I get them out they look scared and try to fly back to the cage (which they haven't mastered yet and hit stuff sometimes.luckily not too strong but I worry about it). how do I go about fully taming them and being able to pet and play with them? I leave the cage open sometimes but they won't move. their dad wasn't tame but always came to the front of the cage when I went there and would accept food from my hand but was a bit aggressive and would bite my finger ( not too strong for it to hurt.) I moved the parents into an aviary. can I also start taming the dad there? thank you.