Peter Pan no Bouken (1989)

Wendy and her two little brothers are brought to the land of adventures, Neverland, by Peter pan, a boy who will never grow up. In Neverland they encounter exciting events and meet with little fairies, mermaids, Indians, and pirates. Required to act as a mother, Wendy never has a moments peace with all that is happening around her, including breath-taking fights with pirates. Later in the series, they set off to find a buried treasure with a map that they obtain from the pirates. (Source: AnimeNfo)