Sunset Home memorial NPC's

[Tilar]

I've been working on getting the cshome memorial npc dialogs and quest worked out from log files from when I was a guide. I have it almost done but I'm at a spot where I need someone smarter than me to give me a direction.

Asherah gives a quest where you need to go talk to the other 4 memorial npc's. Once you talk to the other 4, you go back to Asherah and she gives you a reward and tells you to carry the torch. What I need to know is how would I set it up so Asherah knows that I've talked to the other 4?

I'm guessing that the other 4 set some sort of flag and then Asherah checks for the 4 flags but I have no idea how that would be done. Can anyone give me some suggestions?