Someone didn't read the other comments =P

A house lord can be both a House Lord and Thane

Is this supported by the Lore, or made up.  I'm not finding any other source.  Nothing wrong with making up lore, I do it too, it'd just save me more searching...  (House, and Lord are not exactly rare Keywords, so it understandibly generates a lot of results, even Boolean.)

Look for Game of Thrones and you'll get it

Historically it is.  Only nobles tend to be eligible for promotion to Earl (Where the word Jarl comes from) when the old one dies without an Heir, or is Exiled (As in the Civil Wars) in a Feudal Power Shift.  For instance, the King is deposed, and his son favors certain Lords over others.  Court intrigue, lots of enemies.

I would add in game Examples (Such as all the secondary Jarls, and what's his nuts, in the Cloud District.)  Also, differentiate them from other ranks like Thane, or Jarl's Houscarl such as Galmar, and Irileth.  (The former may be a Lord too, for all I know.  He has a Family Name in Windhelm.)

That's how TZ got the House Lords to be. Inspired in the Game of Thrones story (hence the name similarities) and their ranks (which are based on real life) made the build, logic and realistic. But obviously he added personal touches and improvements (can't kill a dragon sitting on a throne, can you?). He can explain it better than me though.

In your video for House Slarq, it looks like you are wearing a cloak. Is that a mod? If so which one?

Love these builds btw. Just love it. +1

If I'm not mistaken that's from "Cloaks of Skyrim"