[@Catchphrase] Don't mention it man, it's what a GM should do. 

[@Greenie] YouTube is distracting, can confirm. 

It's too bad she can't get a pet Kraken.... or can she? *dun dun duuun* 

[@Abefroeman] Wow you put a lot of work into this, just kudos for that. I really ought to look into this game everyone's playing. 

As for your question, I'm just going to say that I'll assume that at least some of Stannis' supporters survived and joined with Jon or Daenerys later. And yeah quite a few people were probably, executed. But the books don't give an exhaustive genealogy for every house and there's always a cousin who can flee somewhere. I'm just going to maintain a position of preserving canon houses so that future players and PCs aren't limited too much in their options. But there are a lot of blank spaces on the Westeros map. 

If there is a non-canon house in that game map, I would be open to having that be open land that Ser Aerion might be able to take control of. Are there any holdings like that? 

Or Aerion could be non-landed city gentry like the Lannisters of Lannisport.