Hi Fay,
Do you have all three in the same cage? If so, this is the issue and you need to remove the extra male immediately. You can only have one breeding pair in a cage for breeding and no other birds. Even when not breeding, it’s never a good idea to have an odd number of birds in one cage. They eventually end up bonding in pairs, even if they are all the same sex, and the odd bird gets bullied and chase. If the extra male is separate, but close to the pair, you should have a visual barrier where the pair can’t see him, and this may help. The female can’t incubate the eggs and raise chicks by herself – the male helps. You may need to separate the birds and discard the eggs if the fights continue. Otherwise the eggs will get broken anyway, or the chicks may get hurt or killed. If the pair is under two years old, this is also an issue. A young male is more interested in mating than caring for a mate and eggs. He may be attacking her because he wants her to abandon the eggs and mate with him. You can remove him for a few hours to settle him down, then try putting him back. But again, if he or she is drawing blood, they need to be separated and the eggs discarded.
Thank you for asking Lafeber,
Brenda