What does this ghost want?

Hint 1 of 5:

You have surely been to the underworld by now, haven't you?

Hint 2 of 5:

Then you probably saw a mother who'd lost her son.

Hint 3 of 5:

What do you think the chances are that this is her son?

Hint 4 of 5:

Pretty good.  The ghost mother wanted you to give her son something.