He is temporarily staying with Odfel, a fellow miner, because his own house has not been built yet.
Grogmar: "I've been cracking rock ever since I've been able to hold a pickaxe and I'm telling you, this mine is drying up."
Filnjar: "And I'm telling you, you're wrong."
Grogmar: "What makes you so sure? What if I'm right?"
Filnjar: "I know there's ore still in there, I can smell it. You think you're right, you can pack up and leave any time you like."
Odfel: "All I'm asking is that you clean up once and a while. How you can find anything in your half of the house is beyond me."
Grogmar: "I'd rather spend more time in the mine hauling up iron than doing woman's work keeping the house clean."
Odfel: "I'll have you know that I can haul up just as much iron as you in a day and still manage to clean up my messes."
Grogmar: "You think so, huh? Maybe you'd like to put some Septims behind that boast."
Odfel: "You have yourself a bet."
- "You're looking at the best miner in Skyrim."
- "I'd wager I could crack rock faster than anyone. Even you."
- "Takes a lot of strength to swing a pickaxe, know what I mean?"