A Missing Brother - NWN Side Quest (Chapter 1)

Beggar's Nest: A Missing Brother is a side quest that begins by speaking with Jemanie who is found inside a Barricaded Home in the western portion of the Beggar's Nest. The Barricaded Home in question is marked on your map making it hard to miss. You'll actually find 2 Barricaded Homes in this part of the map, the one I am referring to is the northern most one.

For this quest you'll be tasked with finding Jemanie's brother Torin who has recently joined the Cult of the Snake. To find Torin you'll have to make your way to the Warrens of the Damned map which is where you'll find Gulnan, the Yuan-Ti that is involved in the undead infestation of Beggar's Nest. Gulnan is part of the Beggar's Nest: Undead Infestation quest which is the main story quest involving this area.

As for Torin, you can find his body in the southeast portion of the Warrens of the Damned map. The exact map location is shown in my screenshot below. Loot Torin's Ring from his body and anything else that he has then return the ring to Jemanie to complete the quest.