Originally Posted by
Frostbane
Lots of people are Dragonborn. And Christopher Plummer said I was the first to crop up, SO HAH!
Hm? Never had that quest bug up?
1. get a Glenmoril Witch Head in your inventory
2. ask the brother you wish to cleanse to follow you
3. travel to the tomb by any means you see fit, and stand next to the fire
4. tell him you wish to part ways
5. immediately speak with him again and accept quest
6. click fire and kill wolf spirit
If all above fails, then:
setstage cr13 10 <=== this restarts the quest
setstage cr13 20 <=== if you have a witch head already in inventory
setstage cr13 100 <=== finishes quest
Courtesy of the Wiki page, I hope it helps.