I made this Tumblr series based on this picture that I found while scrolling through EunHae pictures:

It's very confusing since it's a family tree to the max, but you will get used to it. This the only SuJu family tree I could find, and this has OT15, which is a win-win.

Of course, this story was one of my first ones, so I didn't give them exact ages so readers could use their imagination. The 'children' are teens, so that gives you an idea of 2005/2006 SuJu, and the 'parents' are, of course, a generation older. 

I changed Siwon's role a little bit. Well, kind of.  You'll see.