He reiterates her questions, and answers them one at a time. Might need a little prompting if he gets stuck remembering the next one, but... more or less... something like this:
"Are ALL sidhe in charge? Noble-whatevers?" - No, not all Sidhe are rulers or nobles, but they are the exceptions.
"Or are there regular-not-knighted sidhe?" - See above.
"If Brekke is a Baroness, does that make you a baron?" - No. I was Sained as a knight, but I'm not a noble.
"Why do we have kings and knights and all of that, anyways?" - Because mortals find the idea of kings and knights to be inspiring, even after all these years.
"If trolls are strong, what are satyrs?" - Passionate.
"How many different kinds are there? There's this real quiet weird kid at school, and I don't think you can be that skinny and still be human...." - There are as many as there are different kinds of Dreams in the world, but the most common are Boggan, Eshu, Nicker, Pooka, Redcap, Satyr, Sidhe, Sluagh, and of course, Trolls. Sounds like the quiet weird kid might be Sluagh."
"How do you GET to the Dreaming? Is it a spell? Where is it?" - "There are spells that will open doors to the Dreaming. There are also... well, like thin spots in the world where you can get in easier. And of course, a rath leading to a trod... that's the Dreaming too."
"Why did you join Liam if they're a bad house? Were you born into it? Could I be in a house? How do you know you're in a house? Is it just for Nobles?" - This question makes him pause, but he answers kindly enough. "I would not say Liam are bad. Of course I wouldn't. We're known Oathbreakers, although I myself have never broken any Oath. I was not born into Liam; I chose it because I felt it best represented my goals. Yes, you could earn membership in a House; you'll know, because it will be part of you. It's not just for Nobles, although generally for a common kith to be part of a House they will have done something to merit both membership and elevation to some title."
"Is the Chieftain in a house since she's a Baroness? Are YOU a Baron?" - Yes. The Chieftess is a member of House Gwydion. And no. As discussed, I'm not a Baron."