This piece remembers me of an anecdote with my twin daugther Sophie.
We were visiting the tomb of her father as she was about 4 years old and her twin brother asked me: "Why are we visiting this tomb? You told us our father is in Heaven", Sophie answered immediately: "Yes, but he sleeps here!".
Sorry if this is sad, the piece shoudn't be unhappy. You know you can invent your own story. I always leave it to the viewer's imagination.