It also depends on if they had the birds since they were babies or if they are rescues , like I said I am sure caiques go through a faze as they get older just like any other parrot and humans nobody is perfect parrots included, But caiques are still wonderful birds to own rather it's your first bird or 10th bird , research and preparation is key..
I don’t want to seem controversial or argumentative towards you. You have hinted that you felt your contributions were not respected as valid (or thereabouts) on a different thread so I am being cautious towards you now.
That disclaimer made; on to my advice.
There are many birds who are perfect babies but then grow up to not be happy in their home situations. Buying a baby bird does not ensure that bird is going to bond to you- it may not even like you at adulthood. And the myth that “hand feeding your baby” ensures a better bond? Not only is it a lie, but rather a vicious one at that.
You can read through the many threads; It’s heart wrenching to have someone who raised their baby now dealing with a bird that draws blood. A bird that is lashing out. A bird that now needs different food and more dark quiet time. A bird that now is showing hatred towards hair color or human gender. A bird that may even be best rehomed if things are severe. Those original authors are in purgatory because their beautiful little sweet baby (who they’ve always done what’s best for) now no longer wants anything to do with them. Your oversimplification of birds reaching hormonal apex as “a phase” that your bird may or may not go through scares me because it sounds as if you either don’t believe your birds will or that if your birds do they won’t change because you didn’t rescue them— which is utterly maddening.
Anyone who has never owned an adult bird can do as much reading, interviewing, and preparation as they can but still not be adept at handling that situation in person. It’s one thing to read what the best thing to do if your bird is acting poorly, but another entirely to be able to swiftly implement it.
And you will be having two birds!, two different personalities!, going through this at the same time. And you’re talking about adding two more! so you can have multiple breeding pairs. Slow down, breathe. You don’t even have an avian veterinarian yet!