A few decades after her original visit, Mary Poppins, the magical nanny, returns to help the Banks siblings and Michael's children through a difficult time in their lives.A few decades after her original visit, Mary Poppins, the magical nanny, returns to help the Banks siblings and Michael's children through a difficult time in their lives.A few decades after her original visit, Mary Poppins, the magical nanny, returns to help the Banks siblings and Michael's children through a difficult time in their lives.