If i understood well the scene with the infernals, you are actually the princesse's prince. You were a man, you were her boyfriend or brother or something like that, and she sacrificed you to the infernals to get a dragon. And the infernals used the prince's soul to make the dragon. Thats why the infernal lord knows you, because he/she/it gave you the body of a dragon(the infernal lord is a woman with a cock, thats why i was saying he/she/it) so you have the soul of a prince, and the body of an infernal. So she is not a mother, but a sibling or an ex, or something like that. The infernals can be met in the mines, the lair in the highlands. They will ask for the insquitrix(i hope i havn't messed up with that word) She is in the bastion, in the highlands city. You can get her by helping the 2 thief girls. Then take her to the lair to the infernals.