Crystalstone (1987)

Deserted by their father and with their mother dead nineyearold Pablo and his little sister Maria refuse to be separated from each other by their caretaker aunt With a cross as their guide they embark on a perilous but ultimately rewarding adventure in search of a mystical gem that holds the key to happiness They escape the fearsome metal hook of a pirate and are helped by a delightfully drunken Captain in their quest for the magic stone