Hello, and welcome to the forum.
I've been reading through this thread and see you just got 4 new keets. I also see that you are very anxious to start breeding them.
May I ask WHY that is so important at this time?
Considering you are new to keets, and don't know the ins and outs of breeding, say nothing about everything there is to know about them, wouldn't it be best to take the time to get to know your new bird friends and all there is to know about keeping them happy and healthy before adding more to the mix?
Have you looked in to proper diet/nutrition? Cage size needed for that many? Different types of perches for healthy feet and beaks? Safe and toxic foods and plants? How many food and water dishes are you providing?
These are all very important matters you should be aware of. Your birds really need to be of optimal health before breeding.
IMHO you should slow down, get to know the birds you have now..let them get to know you and your family and get used to their new home before even THINKING about breeding. Bond with them and let them just BE for a while. Take the time to do thorough research on breeding and bird keeping in general before putting their lives and any possible babies lives at risk.
That would mean separating your males and females at the very least until you have a good solid understanding of things.
How big is their cage? I think you said 80cm tall, which is 30 inches if I'm not mistaken. But how long and wide is it?
Wishing you and your birds a long happy life together. These little guys/gals are so smart and funny if you take the time to learn about their needs, get to know them and bond with them