If your kittens have green discharge from the eyes and nose, the problem is now bacterial (as opposed to viral) and you need to see the vet with them. They will not get over this on their own. They need antibiotics. I would also be very concerned about feline herpes which is common in kittens.
So - step 1 - go ahead and see the vet with them all. The good thing is that most vets will see the whole litter and only charge for one office visit.
Let me know if you still have questions.