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The answer to this is crushing simple. You tell us that they are brother and sister. "Pass the butter," Pamela said. "Get it yourself," her brother replied. Don't try to slip information...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/27916 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27916 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
The answer to this is crushing simple. You tell us that they are brother and sister. > "Pass the butter," Pamela said. > > "Get it yourself," her brother replied. Don't try to slip information into dialog that naturally and properly belongs in narration. It will always sound forced and unnatural and there is no earthly reason to do it. If you are doing this in service of "show don't tell", learn a new rule: Show when appropriate. Tell when appropriate. In a screenplay, this would be a genuine problem. One of the advantages of the novel format is that you don't have to jump through hoops to convey these simple pieces of information. Take advantage of the liberty that the form gives you.