I think those pictures are of an industrial area. You can see a brick built building where the roof and compete inside has been destroyed.Hellish destruction. I'm assuming your relatives are okay @SocketRocket , hopefully so.
A question that maybe you can put to them. Houses in the US seem to be made mainly of wood, ignore cities. As the 3 little pigs confirmed, wood is pretty useless in a strong wind yet again and again that is what they use. Is it a case that even bricks can not cope with tornado's and it is actually more cost effective to rebuild a wooden house rather than a brick one? Alternatively, are they just wedded to the idea of a cheap build and they accept the consequences if they are unlucky enough to be in the path of one of these?