I want to ask this question:
Suppose I know that Tom said something about Lisa, but I don't know who he said it to. So now I want to ask who Tom was talking to when he said this thing. Which one is correct?
- Who Tom said this word about?
- Who did Tom say this word?
- Whom Tom said this word?
- or may any other correct option ...
Edited version to more clarifications as @FumbleFingers suggested:
Suppose we have persons A, B, and C that I know them:
Person A has told a thing to Person B (I was not there). I know the thing that person A has told but to who I don't know. Now I am going to find the person who person A told her/him a thing. So I question from the person C (= who knows the person that person A has told her/him a thing). With included the thing that was told.