Can someone please help me answer these questions on parakeets?!?

My male was the first one I purchased, so I had a lot of time to hold him, and I used crackers, to train him with. It didnt take long for him to crawl up my arm to my shoulder to get close to the cracker. He would even nibble the opposite end of a long piece of cracker between my lips. {I never wanted to be bit on the mouth!} Few months later I purchased the female, she wasnt so easy to handle, trying to bite me. Then a few weeks later I noticed as Raz [male] would freely come to me that Kti [female] would soon pursue him, trying to take every step and fly-by that Raz did. Soon she was the boss, having the first access to me, and the crackers. I wouldnt let them fly around, or be out of the cage too long, so they wont be far from their water, unless they're willing to climb into the cage for a drink. They're small birds, they need to stay hydrated. I do suggest taking them both out, seperately for a while, then both at the same time, at least twice a day. The more time and love you give, the more love and smiles they will give you.