Prayers for the family are there. Prayers for you also as you are there to be the comfort that they need right now. You did not say if it is a Christian family so I will also pray that this bring them all closer to the Lord and not drive them away. Prayers also for comfort for your daughter this is a very difficult thing to deal with at any age, but especially for young ones.
[ "Be still, and know that I am God:I will be exalted among the nations, I will be exalted in the earth. The LORD of hosts is with us; the God of Jacob is our refuge."
Psalms 46: 10-11 ]