May the soul of the departed rest in perfect peace. Poster, it seems your story is contradictory. In your first post, you said the driver was at the office the next morning and left according to his coworkers  and you even said he called the father of the children, now you said he died along with the other 2people. Which one are we supposed to believe. Anyway, may they all rest in peace. 

the main cause is lack of trust and poverty. I mean poverty by avoiding responsibilities