What is the name of book that was called chronicles something had like a grandfather with many secrets and they moved to new house brother sister i think boy found some lit?

Here's why:

* Chronicles: The series title itself matches your description.

* Grandfather with Secrets: While not directly a grandfather, the Professor in the books acts as a father figure and hides a secret world of Narnia from the children.

* Moving to a New House: The Pevensie children are evacuated from London during World War II to the Professor's country house.

* Brother and Sister: The story follows four siblings: Peter, Susan, Edmund, and Lucy.

* Boy Found Some "Lit": Edmund finds a magical lamp in Narnia that reveals the world's secrets.

Let me know if this is the book you were thinking of!