Disappearance Speculations?

Today, I went to watch the first hour of the dress rehearsal of Disappearance. I missed the first couple of minutes and was therefore slightly confused throughout the performance but I tried my best to follow along.

Before I attended the rehearsal, I was skeptical of the use of multiple languages in the play. I did not really know how it was going to be pulled off; I thought perhaps the multiple languages would make it hard for the audience to understand the overall story. However, for as long as I watched, I found the dialogue easy to follow since each portion that was in a language other than English was immediately repeated and clarified through the characters’ words and actions. While watching, I wondered why some members of the cast were sitting on and behind the stage. I figured that this was the portion of the play’s structure that was based upon traditional Noh plays.

Now that I have sat through the first hour of Disappearance, I am thoroughly intrigued by the storyline. Before, I was unsure of whether or not I was going to attend the play, but now I’m going to try my best to make time for it. Although I missed the first portion, I still found it to be funny and engaging. I would really like to see the rest of the play because I have begun to form predictions for the ending. I think that there is something suspicious going on between the brothers and their friend. It seems highly suspect that the younger brother is not in any of the family pictures, that he has to take strange medications, and that without the friend, it seems to be implied that he would not exist. My main question is, did the friend “create” the younger brother? Is he some sort of Frankenstein-like being that needs to be regulated to keep in working order? Was he created as a companion for his lonely older brother?