I’m in my dream class on mythology right now, and our professor had us make a family tree for the Mesopotamian creation story. The tree is a vertical line of boxes for several generations, not exactly what you’d call healthy by our standards. But there’s only so much you can do when you start with one or two creator deities emerging from primordial chaos. It was interesting to hear the reactions of everyone who’d never exactly been exposed to the type of godly incest that occurs in most creation myths.
I can’t say I’ve written any families as strange as the Mesopotamian gods, but I certainly have written families. It’s kind of a requirement, really–a character must come from somewhere. When I plan out a character’s family, I can’t usually get very far without drawing some sort of visual aid. Sometimes it doesn’t really matter who your protag’s great-great-great grandmother was, but in the Book of the Dead (my current project), it does, because that character is in the book. I can’t tell you how many times I’ve had to . tick the generations of grandmothers off on my fingers.
Family Echo is a cool online family tree maker that can probably help some people out with that, if you want to see everything very neat and orderly. It’s very customizable, and has an option for a nonbinary gender as well as adding character details/info. So go crazy! I might make some mythological trees on it, now that I think about it. I’ll post the chaos on my tumblr blog if I do.