I agree with training them seperately. Take one pup into a seperate room, away from the sight of the others as well as sound. Call the pup to you using it's name and hold a treat.
Tell her/him that he/she is a good dog. Move a ways away and call the puppy again. If the puppy follows you, offer a treat then just stand there and wait.
This is important, as it will help to teach the dogs to rely on their own mind and be more confident in themselves, not just that you'll show them what to do no matter what. Ignore the dog, but keep a close eye on the puppy. Once the puppy sits say "Good (name)!"
Give a treat and play with the pup. Call the pup to you and give a treat. Wait once more for the pup to sit down.
It will take a while before the pup gets the hang of it. Once he/she is starting to sit for you right after you call him/her start calling him/her, giving him/her a treat, and then saying "sit!" Wait for the pup to sit down, then repeat "Sit" and give a treat and a pat on the head.
What you've done is to teach the dog's name as well as teach it that the action of sitting is good as well as the command for it. Again, this will take a while. Don't rush it, but don't let the dog ignore your commands either.
It's up to you to train them all at least a little and be sure that they listen to your voice. If the pup gets bored, again, stop right away. Once the habit of ignoring you is formed it's very, very hard to break.
Continue practice until either you are board to the pup looses its focus. Their session is done for the day. Next, either work with another pup or wait until the next day to work with another.
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