Uchiha diagrams and headcanons

This keeps coming up and I need an easy link to give people about it so I can stop explaining it every time and also so that I can start referencing it in fic and have a handy diagram post explaining it, so here's The Post About Our Uchiha Headcanons. Many of these form the foundation of headcanons used in In a Definite Place at a Definite Time. This post was written before we'd taken that on as a group project, I think, but @vagabonddawn was probably writing it a lot already. @pepperdoken and @silver_queen_dos as well as @juno-nine.ao3 and I just... got really really into talking about the Uchiha, you know.

Uchiha family tree.

The first image below shows how various folks are related and what their lineage is. "Lineage???" I hear you ask.

( Ah yes. Here come the headcanons. )

( Cut for large image! )

Clan power structure

There were so many thought processes behind this and I will attempt to sum them up real quick but I'm 100% certain this would come off better in a narrative format and I'm going to forget stuff, but here we go:

( Ah yes, MORE headcanons. )

( Cut for large image! )