Agreed, the biggest and best thing anyone in this family can do at this point, is make clear they are sad and disappoint for MM, acknowledge that they understand why this happened, express some real sorrow for the victim and the fact that this ever took place, and hope for the best for both the victim, and their son/brother/relative going forward.
Then again, if they were a family capable of all of this, the scenarios may never have become what they are today.