I wrote a dialogue as follows:
Then he said to her: "I told you I won't do that! (And I think you shouldn't either)".
Somebody then asked me: How is a speech in a parenthesis?
I'd like to know if you can understand that it is something said in a lower tone, as if it didn't belong to the main line of thought or not. Is it usual in writing?
I've seen some posts such as the following and they look pretty dubious to me: http://www.writingforums.org/threads/can-you-use-parentheses-in-dialogue.61993/
The questions, then, are:
- Is it correct?
- Is it usual?
- Is it understandable?
- Are there alternatives?