I read about the "curse" in The book "The Kitchen Boy", which is a novel, but is also filled with many diary entries and letters that were actual. The letter in the book is the same as Sunny posted. I think it would be quite extrodinary if the letter was an actual prediction by Rasputin, but the likelihood of that isn't very good. Maybe he knew of a plot against him by one of their relations, and also the plot against the Romanovs, and just pedicted by what he knew to be true, trying to scare them, or make people think he was some kind of prophet.