Visiting my grandfather's grave when I was in elementary school

I recall someone in this community mentioning a story about visiting their grandfather's grave for the first time, running ahead saying their grandfather was there, and then waiting with a smile in front of a tombstone they shouldn't have known, for their family to arrive. It seems many people say that young children, perhaps due to their high sensitivity and purity, could see things when they were little. I personally have no such experiences, but my older brother occasionally seemed to see or hear things. On a visit to my maternal relatives' graves, there was a small cemetery reached by climbing stone steps through the trees from behind the main hall. Our family's tombstone was at the very back. My brother said a dog had gone up the stairs, and since I love dogs, I hurried up! But there was no dog anywhere. Then my brother pointed, saying it was behind that tombstone, but neither I nor any of the adults could find anything. I wonder what my brother was seeing.