Actress Emily Mortimer has joined the 'Mary Poppins Returns' cast. The actress has worked on films such as 'Hugo' and 'Cars 2.' Mortimer will play the grown-up role of Jane Banks ? the child who, along with her brother Michael were under the charge of Mary Poppins in the original 1964 film. 'Mary Poppin Returns' already features a star studded cast. Actress Emily Blunt will star in the title role.