I dreamed that a piece of jade sent by grandpa broke in two. My grandfather has passed away. What do you mean? Someone broke it.

From the point of view that science can't explain, it may be that Yu or your grandfather reminded you of the possible disaster in the near future through this dream, and took precautions (just my personal opinion, don't cause psychological burden, but pay attention to the best attention).

Psychologically speaking, you can't solve it. You have to ask the dream interpreter. In short, dreams are a reflection of the real situation. Theoretically, there will be no prophetic dreams. Even if there is, it's a subconscious feeling. Something will happen and be conveyed to your consciousness through dreams.