Answer
The Parent Trap, a well-known film, draws its inspiration from Erich Kästner's renowned book, "The Double Lottie." The story revolves around identical twins, separated at birth, who reunite years later and conspire to bring their unsuspecting parents back together. Kästner's captivating tale of twin sisters, their amusing antics, and the power of familial bonds continues to captivate readers and moviegoers alike.