I just looked into this family for some lore reasons and came across this

http://elderscrolls.wikia.com/wiki/Maven_Black-Briar

.... this family scares me way more now

Join Hevnoraak and well destroy their incisteral behinds

A temporary alliance.... ok

Lazy writing is what I rekon

Uesp does say it is just incorrect dialogue

That's why you don't use the Elder Scrolls wikia.

The dialogue is a bug, Maven is Ingun and Sibbi's grandmother.

Good... Hevnoraak will be pleased

such bad dialog to mess up on a very important character

i mean... eewwwwwww

Yeah its the wiki not USEP so no.

Take anything that wiki says with your weight in salt.

...it's "with a grain of salt".

What you're suggesting is that it's got a lot of credibility.

I know its with a grain of salt. And that suggests the opposite which is why I said your weight instead of a grain.

"To take a statement with 'a grain of salt' or 'a pinch of salt' means to accept it but to maintain a degree of skepticism about its truth."

The grain is the little degree of skepticism.

By saying take it with your weight in salt, I'm saying have a LOT of skepticism.

This is where you shold look: http://www.uesp.net/wiki/Skyrim:Maven_Black-Briar

I think it's less a case of incist and more a case of the left hand not knowing what the right hand was doing when the game was in development, which is probably apt to a lot more than just this.

How do you know? Did you try it?