New Line and director James Wan are rounding out the cast of horror pic “The Warren Files,” signing up Hayley McFarland and Shanley Caswell to play members of the family beset by a haunted house.

Mackenzie Foy and Joey King have already been tapped to play the younger sisters in the true-life Perron family. McFarland and Caswell will portray the oldest siblings.

The Perrons claimed they “lived among the dead” in the 1970s as spirits — both friendly and sinister — inhabited their Rhode Island farmhouse. Vera Farmiga and Patrick Wilson are playing the investigators Ed and Lorraine Warren. Lilli Taylor and Ron Livingston will portray the Perrons.

Peter Safran and Tony DeRosa-Grund will produce “The Warren Files” — formerly titled “The Conjuring” — through the Safran Co. and DeRosa-Grund’s Evergreen Media Group. Rob Cowan will also produce. Wan is directing from a script by Chad and Carey Hayes with shooting scheduled to start Feb. 21 in North Carolina.

McFarland’s credits include “Lie to Me” and “An American Crime.” Caswell appeared in “Detention.”

McFarland is repped by Coast to Coast and managed by Protege; her attorney is Lev Ginsberg. Caswell’s repped by APA. Shanley is managed by Semler Entertainment.