Bullitr....
Please do not tkae the following as an insult, but I went to your page and pulled up all your previous posts and threads and I've come to a couple of conclusions that you really need to hear and consider (whether it hurts your feelings or not, I sincerely have your families and the birds interest at heart here)
1. You are in way over your head. You have an umbrella you are having behavoir problems you should have been taken to the vet and you didn't. You have a blue and gold that has respiratory problems that I highly doubt you took to the vet (if so I'm sorry for this assumption). What antibiotic did the vet prescribe? You have now aquired a greenwing that has temperment work that needs to be done, and should have a vet exam as well. You are in so far, that advice isn't gonna help you too much. My sincere advice is stop getting birds until you master the ones you have. Ideally you should probably just keep one of those birds and get it to be the bird you want. Just because your mother-in-law has lots of birds, does not mean you should too.
2. Take all three birds to the vet for exams
3. Contact someone local to you to help you sort out the mess of behavoirs you're dealing with
4. Keep the cockatoo away from the children completely... you clearly don't have the experience to judge a bird, and you should never risk a child to a bird you can't deal with yourself... especially a male cockatoo.
I am very sorry, I've been watching your posts trying to figure out how to help you, and that is the best I can do.