The Harlot's Husband - NWN Side Quest (Chapter 2)
The Harlot's Husband is a side quest that takes place in Luskan and begins by speaking with Yvette on the 2nd floor of the Wink and Tickle brothel. Luskan is only accessible during the final part of Chapter 2. You can find Yvette inside of a bedroom in the southern portion of the map, use my screenshot above if you need help locating her.
For this quest Yvette asks you to visit her husband Galrone and retrieve her baby. You'll find Galrone in the Slums, when you're standing in Luskan open your map and the Slums are in the northern portion. In fact, Galrone has his own house marked on the map in the Slums so it should be a piece of cake for you to locate him.
When you arrive you'll find Galrone guarded by 2 dogs, you can purchase the baby off of him for as low as 250G or you can attack him and loot the baby off of his body. Be sure to loot his house too as I believe the chest in his building has a 100% chance to give you a magical item. Once you've obtained Yvette's child return it to her and complete this quest.