What to do if theres a tornado!?

ok our house have no basement and some says if we dont have basement use the C.R but our C.R's door is made of plastic! my grandpa (Rudy) says its safe to go to the C.R and my other grandpa (manoy) says to the room (the door is wooden and theres another door made of glass) pls tell me wich is safe! I am just 12! and my mom is in the other place working ! and im with my grandpa and grandma! pls help! answer me no foolishness pls! im just innocent! respect pls..

I don't understand what kind of structure is a "C.R?"

The most important thing is to have a plan that is well thought out that everybody understands what to do in advance so nobody makes the wrong decision at the last minute. Since winds in a tornado can exceed 300 MPH, no above-ground structure can withstand that force with any assurance of safely.

Below ground structures don't have to withstand the force of the wind on the sides. If you live in an area where there is a high risk of tornadoes, it is well worth the time and effort to build such a facility in advance.. The Federal Emergency Management Administration link below has plans for various safe areas.

http://www.fema.gov/library/viewRecord.do?id=5788.