He doesn't need more out and about socialization, he needs to be better socialized within your home with a variety of people. Or, maybe he needs a good correction when he does this with your daughters. I don't know, I haven't seen your puppy in action. But, some dogs that go through a rather stupid period, can be a whole lot better once they mature.
Or they can just be a lot bigger and more intimidating.
Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.