Matthew Garber as Michael Banks Garber worked with his Poppins sibling Karen Dotrice on two other films: The Three Lives of Thomasina and Gnome-Mobile. He retired from acting and public life at the age of 12 and, sadly, died in 1977 at age 21 of pancreatitis. At the same ceremony that honoured his film sister Dotrice, Garber was posthumously named a Disney Legend in 2004. Image Source: Everett Collection