My son always wants to play in the sandbox with his brother.
The problem is, his brother has been dead for years. He survived for a week, but died due to various different problems.
But, it is amazing how much you can love something that you barely knew. Something you knew wasn't going to be forever. It's hard to let go, especially went you felt a connection.
But not one day was sad or short lived for how long he was in the world.