What ever u end up getting the more time you have you and your kids around it as a puppy the better and if it does any thing bad like growl at the kids smack it.
That's what I did with my dog and he's awesome awesome around kids.
He was only bad once and that was went my younger brother got to close to his food while he was eating. I smacked him never again has he done any thing thing like it.
Now I bet there's people who frown apon that but it works