I'll echo what Mike said.
However, to be honest, given that I didnt even know these people existed before the sad events of the weekend, it's not something I would feel mourning for or let play on my mind; It sounds like these people were fantastic parents and gave everything they could for their child, even to the point they ultimately gave themselves. As a statement of love, that so much love can exist in this world we live in, is overwhelming and in some way something to be celebrated, not mourned. If that makes any sense.
I totally agree. What we have sadly seen here is the total love that the parents have given to this child - a love that could not end when he passed away four days before. They obviously had enough faith to believe that if they died at the same time as their son, they would all be reunited. I pray that they were right.