I haven't heard of him at all. But I'm sure there are a lot of things I haven't heard of, and that doesn't make them any less real.

[She's not about to argue with this woman about her own father. After all, who's to say what she's saying isn't true?]

Oh, they're not rare at all. [She shakes her bangle.] You can buy them in shops. Well, some are rare, but mine aren't very. [That isn't exactly true, but she doesn't have the White Materia with her.] They're good friends of mine by now, so I don't think they'll do me any harm.

[Her Materia are all mastered, after all. Maybe it's a little odd to speak of Materia as friends, but Aerith has always been a little odd.]