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The dream is showing you are searching for information regarding the past and your grandfather. Shows that you are going to be shown who your grandfather is and not how "he is portrayed" by your family and what you hear from others. Soiling himself would be showing you cleansing this current view of how you think he is as a person and the dream is just the beginning of being shown who your Grandfather was and you will be obtaining your own view on him. You will most likely receive more dreams about him the more you search for who he was as a person.