Wow. Ardeadai's profile conflicts with Kirnardaz's quite a bit. In Kirnardaz's profile, Kirnardaz had only 1 wife that was a human and gave him a daughter. She was later burned at the stake for appropriating with a demon. It says nothing about having a second wife that was a demon or ever getting a son.
Anyway, Darkaroth is refering to Kirnardaz's deceased human wife. I just assumed that Ardeadai and his daughter came from the same place since you refer to Ardeadai as a demigod, a half-god, instead of a full god.
One more thing. Ardeadai's profile is quite short. Perhaps you should add a bit more detail.