Well, you came to the right car forum...veterinary assistant here.
Beagles are great with kids. They're a little rambunctious as puppies, my friend got one about a year ago and she would always run over and nip your feet and run away. But that's nothing that obedience school can't fix. They're quite gentle with kids, and once they grow out of the puppy stage, they're actually very calm animals. Then again, every dog has his or her own personality.
Are you planning on getting a puppy or adopting one from a shelter?