@HayashidaYuki god I hope not. Only way I see that happening is if his brother isn't dead and asks him to spare the father as he's about to kill him. I do hope the brother didn't die but I also hope he's not dumb enough to ask for the father to be spared.
On a side note I hope that demon girl from his previous life is alive. Not sure how long the demon race lives in this series but I'd imagine their lives are longer than humans and magic can probably extend it some. It would be cool for MC and her to have a reunion. Or maybe one of her descendants becomes his romance interest later on if the original demon girl has died by now.
Well, that was merciful. If it were me, I would never be that merciful. I would keep them alive and make sure they suffer so much that they'll wish they're dead instead, but I won't let them take their own lives. They really have to die slowly in sufferings.
He should've done that from the beginning. All else just feels lame to me, if you have the power to completely eradicate everything in one fell swoop in the first place.
wouldn't it be wiser to check on your brother condition even if it's a small change of him being alive, his body is still intact . With your amount of power, it wouldn't be hard to retrieve his body and check it out and at least hear his last words, then go rage mode to found out his is dead.
Good to see that our dear MC actually has the balls to kill these traitors. Too many mangas out there with holier than thou MC's who spare as many enemies as he can.