Provide a premise that would permit the value-expressing conclusion "Sarah ought to tell the truth" from the descriptive premise "Sarah's son is asking if he's adopted."
Sarah's son is asking if he's adopted.
Sarah's son has access to his birth certificate, and intends to see it soon.
Sarah ought to tell the truth.
The value-expressing conclusion "Sarah ought to tell the truth" can be justified from the descriptive premise "Sarah's son is asking if he's adopted" by adding the premise "Sarah's son has access to his birth certificate and intends to see it soon."
The additional premise supports the idea that Sarah's son has the means and intentions to confirm or disprove the question of his adoption. By keeping the truth hidden from him in this situation, Sarah would be depriving her son of vital information about his own identity and potentially causing confusion or harm in the long run. Therefore, in order to act in her son's best interest and uphold honesty and transparency within their relationship, Sarah ought to tell the truth.