Maeterlinck's Blue Bird: Tyltyl and Mytyl's Adventurous Journey (1980)
Set in a German-speaking country in the seventies, brother and sister Tyltyl and Mytyl live with their parents, a dog and a cat. When their mother becomes seriously ill on Christmas Day, Tyltyl and Mytyl receive the visit of Berylune fairy. It entrusts them with the task of finding the “blue bird”,