The Adventures of Tintin
(2011)

Saccharin's ancestor was the pirate who raided Captain Haddock's ship carrying 400 weight of gold and treasure. Each of the three Unicorn ship models contained a small scroll intended for Haddock's 3 grand children. Together, they reveal the location of Haddock's old mansion, where Tintin and Captain Archibald Haddock III discover the map that may lead to the location of the sunken treasure (sequel??)

Thanks Herbmeistr!