Hi Teacher 863211,
I was appointed as my dad's agent by DS-3032. Recently, when I drafted a letter with a checklist for all documents( including his DS-230 Forms and supporting documents) to NVC with my signature at the end of the letter,
I realized that whether this would be appropriate for me to write such a letter to NVC
-Yes, you need to sign teh letter. Just provide all the documents NVC requested.