Ancalagon has actually been wondering that himself for a bit, but does not mention it, telling them that he had been using a spell to prevent his seed from getting them pregnant if they broach the subject with him, which he had been. He then helps his daughter settle, and wonders what to say after that, having never been in the position of having a daughter before. He does not go into his past much, saying only that he adventured for a bit, and wandered a lot.