I'm sorry for your loss, I understand you are hurting. I wish you comfort.
Sometimes truth hurts, and I don't wish any more hurt on you at this time. But I don't know you and can't come back at the appropriate time, so I have to say what I would say, now.
Before this happened, you knew that people die for various reasons, quite often unfairly. Yet you still believed in God, your faith was strong. But now it has happened to someone close to you. Do you think the others that died didn't have anyone who was close to them? What makes only you and the people in your corner exempt from death and tragedy? The bible tells us the opposite- that we, nor the world we live in, are promised another minute of physical life. I believe God saves those who will bring about His Will until the hour He decides our time is up.
This is shown all through the bible and through history, and includes Jesus Himself, so why do you think you and your are the only exception in history? I ask you this because I have asked myself this very question to prepare my mind before tragedy happens, if it happens. These are hard questions to contemplate, and honestly, I don't know if I can ever prepare my mind for such tragedy no matter how long and hard I ponder.
But I have come to a conclusion: Show love as much as you can while you are here. Worrying about tragedies that might happen only cuts the quality of life even shorter, so is mourning to long over tragedies that did happen. But the most important of all is I want to be with God forever in heaven, and with those who also love Him- whether I was related to them or not. And I don't want to go where the evil and unbelieving are going, whether I was related to them or not.
There have been times where my faith got violated by the evil one who uses every opportunity, weakness, tragedy, etc. but one thought has been my solid rock that recharges my faith. And it is that I see that right and wrong are real, good and evil are real, and so is the source of them- God and satan. And I'm not going to let the evil one trick my mind into thinking that I don't have to believe in or obey God. And no matter what happens, after the smoke of the battle clears, my faith remains.