What is the main idea of Mary Poppins movie?

The main theme of the Mary Poppins film is the importance of family, love, and finding joy in life. Throughout the movie, Mary Poppins helps the Banks family, a wealthy but dysfunctional family in London, rediscover their love for each other and embrace the magic of life. Through her magical interventions and whimsical songs, Mary Poppins encourages the family to value genuine relationships, communication, and imagination over material possessions.