females dont have light blue ceres good luck with all those keets and hope you are doing a quarantine and not putting them altogether for 90 days they need to be in a separate cage

Honestly all are in a cage because we have bought them only three days after the others ,and we have bought them from the same deler ,and I have got this informations from budgies place that we have light blue in females .

Budgies are sexually dimorphic in only one way: the cere. The ceres of young budgies under 8-12 months are all about the same: a bright pink or violet color. As the budgie sexually matures, the cere changes according to the budgie's sex.

Females - White/light-blue, tan, or brown cere. This is true for all varieties. With the development of brown color is a flaky texture. This can build up to be about a centimeter thick.
Males -
Blue or purplish-blue cere in normal varieties only.
Bright violet or pink (does not change after youth) occurs in the following varieties: recessive pied, lutino/albino, dark-eyed clear, lacewing, and fallow

If your budgie is less than one year old, the above rules are not applicable. The cere usually begins to change before one year of age but appears relatively ambiguous. A younger budgie's cere can appear to be changing towards one sex and then change the other way upon full sexual maturity at one year of age. However if your young budgie's cere develops the brown flaky appearance characteristic of female budgies you can be sure it is a female. You can also look at behavior to determine gender. Males often bob their heads, sing, and are usually more active and outgoing. Females are usually snitty and bossy over other budgies in the cage, and rarely sing. Females also usually make loud mad budgie sounds. Males sometimes make this sound too, but usually only when singing. If your budgie makes mad budgie sounds often it is most likely a female. Click here to hear a "mad budgie" recording

I have sent three new pictures in photo gallery ,and we have two blue there one is much more blue which is male ,and the other with a white and blue cere is female .

then from what your saying you dont have young birds...these are older birds you bought from the dealer and not babies and as such there is no way of knowing how old they really are...

They are not old they are around 1 years old

My cage is big enough for four parakeets even they can fly inside ,the height of the cage is 80cm .,and I have put two boxes with small gap up to each other.

and how can you be so sure of their age...by what the breeder said?...i hope thats not what your going by because unless a breeder keeps records and i dont see leg bands on those birds even the breeder cant be sure...and the size of the cage wont make a difference if a pair decides to go to nest it will still be interference with disasterous results ...i hate to sound so discouraging but you really need to learn about this stuff more...but ...good luck with it all...for the birds sake for sure.

ok thanks for all information and have you seen the cere of that sky blue one ?they told me that its female ,do you agree too ?

By sky blue I mean the one which has white wings and some light blues I told that one female with a light blue and white cere ,and the other one which is much more blue with ourple cere we told that male do you agree?

well ya know that one is a pied mix and if it is only a year old believe it or not pied have this tendency to keep a somewhat pinkish cere a bit more before really knowing ...i know cappys didnt really go blue till around 18mos and stayed pinkish...and the same with the other ...right now to me they both look to be males... a bit more time will let ya know on these.