What do you say

Reba has a song that seems appropriate for today. What do you say at a moment like this? My brother in law's fiance just lost a very young member of her family to a tragic accident involving a moving vechicle. I am far enough removed, having met the child perhaps once, that I am not distraught. Sad, yes. To lose one so young... My brother in law is very upset. What do you say when someone loses a child to anything, disease or accident?
Because damn it, there are no words for that
There is no sympathy card
No flowers with note
that could help them through their grief.
And in the case of a vehicle accident, there is no donation to prevent others from facing the same things. When a child dies because of a disease, you can make a donation in their name to the foundation fighting that disease. But when a child is randomly struck by a vehicle that's jumped a curb...
What do you say?