The play floats back and forth in time, flashing back to some moments when the couple's children are still around. Mike's fear of germs is his fear of intimacy. Since losing her child, Tish has been living in denial and refused to leave their house because she was afraid that her son would miss him when he came back.
The reality is confusing. Mike gives the impression of being an upper-middle-class howard hughes. His life is full of intense grief over the loss of his son, which reflects his relationship with his father and makes him unable to express or feel love.
Sometimes, the confusion of characters will hinder the work. The depth of the story has hardly been explored. You want to know if this son was murdered by Mike or if he accidentally let him die. You don't even know if anyone else has a son. This is a sense of reality that you will never get, but I believe this is what I want.