Michael and Jane Banks are two of four children of George and Winifred Banks in the children's book series, Mary Poppins, written by P. L. Travers. In the 1964 film version, they are the only children. They were played by Karen Dotrice and Matthew Garber. Katie Nanna's stormy departure suggests that the children are impossibly undisciplined, and they do demonstrate some evidence of this in their own advertisement for a new nanny, as they promise not to "hide her spectacles so she can't see, put toads in her bed or pepper in her tea" while smiling at each other in remembrance of jokes on former nannies. Once Mary Poppins arrives, the children come across as mostly sweet and innocent.
In "Lethal Weapons", they ask Mary to promise them that she won't ever leave them with unexpected results.