One day he was going on about Kiki, how she does things in a certain way and I kept him going by say how interesting it was. He then turned to me and asked “You know that Kiki isn’t real, right, I made her up?”. He doesn’t like lying or being lied to, so within that frame I guess he wanted me to confirm that it was just play.
Our child has one. Her name is Kiki and she lives on a farm where she drives her tractors in a village called Plamplams. She speaks also an imaginary language. It seems like she represents experience he lives through vicariously expressing some image he has on how he fits in this world. We as his parents have always encouraged him; it is wonderful how he develops such creative images.
Of all the things wrong with this, what sticks out to me how he seemed to be offended when you put down your boundaries. I feel sorry for your sister and i would share this with her. If he behaves like this with his own family, it doesn’t bode well outside of it. Yeah, perhaps replying wasn’t the best idea but i cannot put myself in your position vis-a-vis your state of mind at the time but it doesn’t take away the lack of appropriateness of his comments.