Mcfluffles answer your questioned already, though in a sarcastic way.
But I will apply the answer in a more clear way. I can't answer this question because this is a question based on a hypothetical, which would obviously go in a thousand directions.
Is this a loved one who didn't know why it happened? Did the loved one know about it, and decided not to take on a path of revenge for a justified killing? Did the loved one knew about it, and think it was pretty funny to see the victim's family killed? Did the loved one was abused by the murderer and decided to try to kill the victim in retaliation of the revenge killing because they believed in some stupid bullshit belief of "honor thy parents"?
Again, it's difficult to answer this question, because it's based on a hypothetical. Personally, I don't know. But if I was the victim, the answer would be "fuck no."