Stanley Sorenson also known as Grandpa Sorenson is a main character in Brandon Mull

Brandon Mull

Brandon Mull is an American writer who is best known as the author of the Fablehaven fantasy series, which is a New York Times' bestseller. Mull has also written The Candy Shop War...

's fantasy series Fablehaven

Fablehaven

Fablehaven is The New York Times best-selling children's literature fantasy series written by Brandon Mull. The book series, which includes Fablehaven, Fablehaven: Rise of the Evening Star, Fablehaven: Grip of the Shadow Plague, Fablehaven: Secrets of the Dragon Sanctuary, and Fablehaven: Keys to...

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Fablehaven

Grandpa Sorenson is Kendra and Seth's grandfather on their father's side. He is the caretaker of Fablehaven. Grandpa leaves clues about the true nature of the preserve, in hopes that Kendra and Seth will discover the truth that it is a preserve for magical creatures. The kids do figure it out, but soon afterward Seth, in a moment of bad judgment, makes it possible for unsavory creatures to enter the house, and Grandpa and Lena are kidnapped. They are held hostage by the witch, Muriel, at the Forgotten Chapel where she is endeavoring to free a demon named Bahumat. Grandpa is married to Grandma Sorenson who spends much of the first book in the form of a chicken.

Fablehaven: Rise of the Evening Star

In book 2,over the Summer, Grandpa has Vanessa Santoro, Coulter Dixon, and Tanu Dufu train and teach Kendra and Seth for future adevnturing.
The Society of the Evening Star, an ancient organization determined to overthrow magical preserves and use them for their own intents and purposes, is determined to infiltrate Fablehaven. Grandpa, invites the three specialists to help protect the property: a potion master, a magical relics collector, and a mystical creature trapper. In addition, these three specialists have a more perilous assignment—find an artifact of great power hidden on the grounds.
Vanessa is then revealed as a traitor and a member of the Society. She takes over the house along with Christopher Vogel, whoposed as Errol Fisk.

Fablehaven: Grip of the Shadow Plague

In the third book, Grandpa gets turned into a shadow after he decides to go after the artifact.

Fablehaven: Secrets of the Dragon Sanctuary

In book 4, Grandpa comes out of retirement and becomes the new Captain for The Knights of the Dawn.

Film

A Fablehaven film has been confirmed but it is unknown who will play any of the characters.