User blog comment:Forestpaw13/An explanation of genetics -- Quarter-bloods/@comment-1892785-20100320184528

I think that a quarter blood makes sence. A kid of Percy and Annabeth would be 1/4 Poseidon, 1/4 Athena, and the rest would be human. That's how it works. And if I'm wrong, it doesn't matter, that is just what we call them.