Thank you all for your prayers. I know they are comfort to the family. Only GOD can reach into such despair and bring deliverance and healing.
Liz, the family is going to be tested, in case it was from a condition that can be inherited related to blood pooling/clotting issues. If that's the case, it's supposed to be detected by bloodwork.
Again, thanks for your prayers. They stay on my mind, and I just keep laying them before Him in prayer & speaking His blessing/healing/comfort/life into their lives.