Er, I love the Wizard of Oz, but Mary Poppins is definitely way more substantive and "adult" (which, btw, are two separate qualities) than Oz, particularly wrt the Banks' family dynamics. I really don't see how Mary Poppins is more kid-focused -- how? The main characters of Mary Poppins are the father, Mary, and Bert. The kids' role in that movie is much more focused on facilitating the general plot and the arcs of other characters and storylines than Wizard of Oz, which is all about Dorothy's personal story, so Oz is far more kid-focused, even though Jane and Michael are younger than Dorothy.