The Parent Trap is a film series originally based on Erich Kästner's 1949 novel "Lottie and Lisa" and produced by Walt Disney Pictures. The series began with the 1961 film of the same name with Hayley Mills playing both roles of twin sisters who were raised separately by divorced parents, without any knowledge of each other. They meet at a summer holiday camp, and switch places so that they can each meet their other parent. Mills reprised her roles three times in subsequent made-for-television sequels.