We can't draw any conclusions from the lack of communication, since the roads and communication systems are out (debris and flooded), and if there isn't a ham radio operator, who also has access to working equipment, there is no way to get word out. People have made it through some amazing situations, they are often incredibly hardy.
This next part is not specifically to you, but all of us:
Since so many persons are reading this thread desperate for any sense of how their family back there fared, I think it is a very, very bad idea to speculate on worst case scenarios when we simply don't know. I am NOT going to estimate, but rather just put out what is reported. History tells us strongly that most of the persons reading this and worried will eventually get good news on their relatives, let's not put them through unnecessary torment. Am not at all advocating lying or sugarcoating or burying the truth, but rather refraining from engaging in the other extreme of doomsday speculation.
CNN: rescue efforts are overwhelmed. persons and pets tangled in wires on the roofs. Rescuers dropping flares to mark future pickups. 300-500 trapped in his estimation.