Male atiel aggression?

We have a male atiel i know he is a male because he is vibrant in color and his cheeks are a bright orangeish color. He shares a cage with the female she is very tame and loveable they are both brother and sister because they came from the same mother. Well the thing about the male is that we fed him from day one that he was born btw they are almost 2 years old. But he is very aggressive towards people They share a huge cage so they have room to roam around in it But he is as well aggressive towards the female once it comes to them eating so we have 2 food bowls and one water bowl for them but he seems to not want her to eat. We have tryed to tame him but there is nothing more we can do. Does anyone have a idea on how we could get him to finally calm down and be nice? And yes we do try to get him out of the cage as much as possible.