Remember back on the identification portion of that one reference sheet I had that read 'Undergone Tertiary Mutation'? Ever wonder what that meant exactly? Oh, of course you didn't - but if you're wondering NOW, here's the comprehensive breakdown of how the Grandville linage works and how it ends up so diverse despite the fact that it has a string endogamy system. Oh, and since it would have cluttered the graphic:

Primary: 3 Weeks to 2 Years

Secondary: 5 Years to 10 Years

Tertiary: Amorphous Adulthood