06- Zombie concert -Horror screaming

Kenny moved with his family to live with his grandfather in a house with a frightening and dispersed view of the graves, but he does not care about that, as he does not believe in the existence of ghosts. Unlike his grandfather, that old man who is old who is still having nightmares about zombies, so that he does not stop talking about his adventures with them with everyone and anyone, which Kenny and his sister Tricia consider tales of fiction.
Will Kenny and his sister succeed in removing delusions and fools from the grandfather?
Or does what is proven to the existence of the zombies already?