I've had quite a few dogs and have obedience trained to quite a high level with one of them, and I still took my recent pup to puppy preschool at the local vet.
I really enjoy it and you can practise training sit/stay/drop in a high distraction environment.
Quite a few people had their kids there too and the instructor got the kids involved in the training.
I also got a doggy bag filled with lots of goodies and a discount voucher for desexing.
You and your kids would love it I'm sure, and the kids can show off their pups puppy school graduation certificate
Also, your pup will be a BIG boy so make sure he is on large breed puppy food.