That whiteface grey male is a beauty. To try an tame them down, get yourself some "Egg and Biscuit" mix, its meant for raising insectivorous birds. Mix it up with warm water, and put some on one of their perches. If they dont eat it the first few times, keep trying, they most likely eventually will. Once they are eating it (and its pretty addictive stuff, they love it), use a small plastic spoon to and let them eat off it. Once they are comfortable being that close to you, hold the spoon in one hand, and put the other hand in between them and the food, so they have to step onto your second hand to get the food. They wont do it immediatly, but dont just give in and go back to feeding them without them having to 'step up' onto you hand. Eventually they should get onto you hand to take the food, and will get more confident the more you practice (you have to do this for a couple of minutes a day, a few times a day may be better, im not sure). You can also try with things like broccoli and celery heads (NOT letucce), seeding grasses, etc, if they love their green stuff (which should be part of their diet, if you're not already giving it to them then start).
If they are biting HARD, its one thing, if they're just hissing, aggressively 'nibbling' you hand and acting catty, its totally different. If its not hard enough to hurt (and they can hurt when they want to) then you just need to persist, otherwise the bird knows you're afraid of it and will continue to put on a show. If they werent hand raised it will be harder, and the bird probably wont become really tame or bond with you(ie, wont seek you out and get annoyed when your not there), but they will still calm down to the point of sitting on your shoulder, letting you scratch, etc, so keep trying.
You may need to be careful with the old grey girl, she looks a bit frail, if she has trouble flying just make sure she doesnt get a shock and fall to the floor or something.
Hope that helps in some way
