How will I know when our two Babies are starting up more than just the kissing phasse?

Hi, If all that you say is true, you should not allow them to produce babies. In order of preference:
1. Separate them, 2. Do not give them a nesting opportunity, 3. Remove any eggs produced, 4. Pin-prick any unremoved eggs, 5. Trade one of the pair for an unrelated new partner, Then let Nature do the rest!

I have two parakeets, they are both males. They have gone through the preening, feedings and so on, but they have not actually tried to mate. They just keep each other company.If you are not sure of your birds relationship to each other, I would seperate them, or remove any eggs and replace with artificial ones.

the female should start crouching down with her tail to the sideand making sounds . the male should recognise this and breed her

Lovebirds can start breeding at 10 months of age. Althought that is much to young and very stressfull on the female. She is still growing and may not have the vitamin and mineral reserves to produce eggs. Are you positive of their genders? You can have both girls or boys that will preen and feed each other but not try to actualy breed. If they are from the same clutch they should recognize that they are related, at least that is how my cockatiels are. If they are trying to breed then you must separate them. If you can't separate them make sure any eggs laid are either pulled, made infertile or replace the real eggs with fake eggs (yes, you can by fake eggs). Inreeding can cause multiple health issues and deformities for the babies. If she starts laying eggs make sure she gets plenty of calcium and a very good diet of pellets, fruits, vegetables and seed. Good luck.

You cant tell animals not to "do it" they are all run on hormones not logical thought. They feel like it, they do it. I am not for breeding anything that is brother or sister. Genetics aren't to kind when it comes to breeding mutations with siblings. I'd seperate them and not let them breed.