Mary Poppins Returns development hell since the release of the 1964 film. Walt Disney attempted to produce a sequel a year subsequent to the film's release, but was rejected by author P. L. Travers, who had openly dismissed Disney's film adaptation. In the late 1980s, then-chairman of Walt Disney Studios Jeffrey Katzenberg and vice-president of live-action production Martin Kaplan approached Travers with the idea of a sequel set years after the first film, with the Banks children now as adults and an older Mary Poppins with Julie Andrews reprising the role. Travers again rejected the proposed concept with the exception of Andrews' return.
Mary Poppins is the youngest and is born midway through the second book. Though the ages of the children are never made explicit, Jane is estimated to be around seven years old in "Mary Poppins", and John and Barbara have their first birthday in the same book and appear to be around two years old when Annabel is born. Only Jane and Michael appear in the film and stage musical. In the film they are portrayed by Karen Dotrice and Matthew Garber; in the 2018 sequel, they are portrayed by Emily Mortimer and Ben Whishaw. George Banks is Mary Poppins's employer. He