Their plans for opening a restaurant 'came to grief' when they failed to get a loan.
He has been unable to recover from his 'grief' at/over his son's death.
“He's burned the toast.” “'Good grief'! Can't he do anything right?”
(..) Loki, enough. No more illusions. Now you see me, brother. Did she suffer? I did not come here to share our grief. Instead I offer you the chance of a far richer sacrament. Go on. I know you seek vengeance as much as I do. (..)2013 Thor: The Dark World
(..) I'm not asking you to. The realms need their Allfather strong and unchallenged whether he is or not. But he is blinded, Heimdall by hatred and by grief. As are we all. I see clearly enough. The risks are too great. Everything we do from here on is a risk. (..)2013 Thor: The Dark World