Get a cage for your puppy and put the kids in it
. Seriously, if your children keep pestering the puppy he'll soon learn that a swift bite will put an end to his torment. You could then end up with an adult dog that will bite, and it won't be his fault. Puppies should be able to play and sleep without being constantly tormented. They do need to be handled and played with, but in a controlled fashion.
I don't have any young children living with me so my pups have been able to grow up without being constantly played with or tormented. I have been happy to have friends' children play with and cuddle my puppies - it's good for the pup's socialisation - but on my terms. Consequently, my puppies have all grown up to be lovely natured dogs. My recent addition, Jamie, is turning out to be a delight. He likes to play, and he likes to be cuddled, but he also likes to sleep in his bed, and there is nobody to disturb him. I'm hopeful that he will turn out to be as lovely as Charley and Henry.