Often, when I want an NPC to say a final goodbye to my PC and then leave, I'll just add the following very simple script to the 'Action Taken' part of the last node of a conversation tree between the NPC and my PC:
ActionDoCommand(DestroyObject(OBJECT_SELF));
Basically all it does is cause the NPC to say goodbye, and then to fade away.
But now let's say I want more than one -- specifically, two -- NPCs to leave in this way. At the same time. How do I do it? I'd very much prefer not to have to talk to one first, have him/her say goodbye, and then talk to the second one and say goodbye to him/her. (The reason is that I'm trying to simulate a mother -- the NPC to whom the PC will be talking -- leaving with her child.) Presumably I'll need to add a couple lines to the script above, where I reference the second NPC (yes, it's the child) by her tag and then apply DestroyObject on her as well. Only trouble is, I don't know how. My knowledge of the language of the script is meager.
It is therefore with humility that I ask again for your help. You have all shown amazing patience with my lack of knowledge of NWScript, and for this I thank you yet again.