Board Thread:Lore Discussion/@comment-6716700-20130319133042/@comment-7153552-20130403211837

Flamedude22 wrote: Revenge. Night Mother, no. The other members, may find it nesicary to take revenge for a fallen member, they are a close-knit faction (Hence Brotherhood) and I think they very well may take revenge for a death of a fellow brother or sister.

I would agree with you if the Night Mother wasn't back on top in the line of priority. By the end of the Dark Brotherhood questline the brothers and sisters aren't going to do anything to upset the Night Mother or her Listener (and I wouldn't upset her caretaker, either, he creeps me out!).