The kids dad died and he was rich and the kid found books about fairies

Upon moving into the run-down Spiderwick Estate with their mother, twin brothers Jared and Simon Grace, along with their sister Mallory, find themselves pulled into an alternate world full of faeries and other creatures.

The coming-of-age story of the Grace Family, as they move from New York to Michigan and into their family's ancestral home. Upon arrival, the family not only uncovers mysteries hidden inside their great grandfather's Spiderwick Estate, but also discovers a secret, fantastical world around them.