Fantasy Book That I Once Borrowed From a Library
It's been about 15 years since I read it, so details are vague, but lacking the name has irked me.
I read a small paperback, relatively battered, between 2004-2009 from the library, so I can assume it was printed a while before that.
It was a fantasy book, I'm fairly sure classed as YA. It covered a few kids (5 of them? Teenagers?) all of whom had powers. These powers came from their parents, and I remember there being four distinct "pantheons" of sorts (maybe "families"). All of them magical, and I believe one of the pantheons was known as the "Athenians".
Distinctly remember two of the magical kids arguing that they had the same types of magical abilities. Yet the boy was arguing that they do not - their families have different magics. His point was that one of the girls could transmutate something just by wishing it, whereas he had to know some bits of chemistry, to get it to transmutate.
For some reason that conversation between magic-users / children of gods / whatever, arguing that some magic is instinctive and others need to know details really stuck in my head.
I couldn't tell you anything else about the book at this point, but it has lived with me for years as a point of frustration that I can't even remember the name, let alone whether it was good or not!