Incredibly sad news. Our prayers go out to Siran and his family.
I am heartened to know that Siran has professed faith in Christ and one can assume that there is a good chance his family are / were Belivers as well.
We struggle with the "whys" in this life. Why do bad things happen to good people, etc? I do not presume to have all the answers, but by faith I believe that anything this side of hell is grace. As hard as this will be for him and his remaining family, I am reminded of this verse:
And we know that God causes all things to work together for good to those who love God, to those who are called according to His purpose. - Romans 8:28
Those deceased believers are at this moment present with Christ. They do not hurt, they are not sad, they are enjoying a joy and fulfillment we cannot imagine.