I am not an attorney but unfortunately have been around some of these unfortunate situations. From what I have seen and obviously each situation is different, where the alcohol was obtained is irrelevant. Was alcohol involved and did it contribute to the tragedy? The question is about the road correct? The parents know the defense is going to bring up BAC levels and estimated speeds, the attorney prepared them for that.
I have seen parents just say forget it, what's done is done and others try to get everything they can, not necessarily money. In one case, the county awarded some money, how much I have no clue, because the road was not properly maintained and the grader left ripples that caused the driver to lose control. On another a girl was driving a friends car and just barely went off the road and went up a guide wire to a pole and the wire flexed and flipped the car over. The family of the girl that died only wanted the county to make certain there were no guide wires going against traffic which they eventually did. On the first case I mentioned, some other friends lost a daughter at exactly the same spot in the road. If you drove it you would not be impressed by anything unusual but two girls and boy were killed there. I feel for the families and unfortunately this isn't going to be over for a long time.
Someone asked if there was liability insurance and attorneys. In all three cases, the answer was yes. There was a local attorney who was the designated "county attorney" but the county can decide to hire someone else as this is beyond the scope of what they are paid a retainer for. In some of these cases, the county elected to have their insurance company pay out instead of racking up crazy attorney fees and go to court. That is just how these went, I don't know about that area of the world.