I'm sorry about your loses. I know what you feel is a hard thing to go through, and I'm sure that everyone here on this site can feel sympathy for you. I went through something about five months ago, but it still feels like it just happen last week
He was only 18 and driving too fast down a back road. Doing 80 in a 25, a curvy bumpy road. Everyone knows where it happened, because at one point everyone had sped up to hit this one bump and make it in to a makeshift ramp/jump. He had two people in the car with him, both of them not wearing a seatbelt, and him being the only one that was. They landed the wrong way, lost control, rolled about 14-15 times and the driver side hit a tree. The two without a seatbelt were fortunate enough to make it out with only scratches, but the driver broke about 80% of his bones from the impact of the rolls and the tree.
It's something that stays with you for a long time. I don't want to say, don't worry, it will all pass soon and everything will be okay, because in some cases, it's just something that you think about a lot during the days passing. I do want to say that at least you know there are people around that can comfort you, or maybe even you comforting them. Of course you can know that you also have all of us on here if you need anything.