TJ and the Haunted House (Orca Young Readers)

In this sequel to TJ and the Cats, TJ and his best friend Seymour are back, joined by a classmate Amanda. TJ does not believe in ghosts, so when he agrees to create a haunted house in his own home as a fundraiser, he does not anticipate problems, at least not until it turns out that a ghost may inhabit the spare room in his century-old house. The ghost, real or imagined, leads TJ to some fascinating family history. TJ finds a way to bring that history alive for his family. The kittens, offspring of two of the cats from the first book, lead the way.