Acting sibs Willow and Jaden Smith are attached to star in Warners’ adaptation of Kazu Kibuishi’s “Amulet.” Akiva Goldsman’s Weed Road shingle and Will Smith and James Lassiter’s Overbrook Entertainment will produce.

Graphic novel centers on a brother and sister who move into their late great-grandfather’s home after their father dies. They must use his amulet to rescue their widowed mother from a beast who lures her into an underground world.

Five books are planned in the Scholastic series, with the second installment skedded for release this year.

Seven-year-old Willow next appears in “Kit Kittredge: An American Girl Mystery,” due from Picturehouse in June, and previously appeared with her father in “I Am Legend.”

Nine-year-old Jaden appeared with his dad in “The Pursuit of Happyness” and next appears in Fox’s remake of “The Day the Earth Stood Still.” He’s also attached to “Newton’s Law,” another Overbrook project set up at Columbia.

Weed Road and Overbrook have collaborated on several earlier projects, including “I Am Legend” and the upcoming “Hancock.”