We're a very calm household. For the last month our 4 year old has been complaining about a 'mean ghost,' and a 'happy ghost' that comes into his room. He told us last month he had to catch the ghost and chop it up with a knife. I was a bit concerned about that rather violent thought, but we just wrote it off as an overactive imagination.

Last night our son was really scared before bed. He was just talking and talking about this 'angry ghost' that will "kill mama, kill papa, kill baby, kill me."

I have no idea how to handle this. I'm worried that there is something wrong with him. Is this normal 4 year old behaviour? What do I do? Also, our 4 year old is very attached to his 1 year old brother.