It's doubtful whether that is possible and the family seems (understandably) grief stricken by this. The child is not coming back. Its now the duty of the OP to

It's doubtful whether that is possible and the family seems (understandably) grief stricken by this. The child is not coming back. Its now the duty of the OP to take care of his partner with needed counselling, may be moving to another place etc. The pain won't go away regardless of the outcome of a lawsuit. OP, I'm sorry for your loss. Things like this takes everything from us. The only thing we can do is move on and contemplate. In my personal belief, that it is only possible through spirituality. The grief is expected and completely normal. Its a result of your love for your son. The ache will be there throughout your life. I would suggest (if your finances allow), to use the settlement money to do something good for other children on an annual basis (however small it is).