There aren't "sisters." They are exactly the same thing.
Tornadoes and twisters are the exact same thing.
Tornadoes are sometimes called twisters.
Answer: Tornadoes
Tornadoes are often called twisters. Some people call them cyclones, though this is not a correct name as it already applies to something else.
Tornadoes are often referred to simply as "tornadoes" or "twisters."
Tornadoes are often called twisters.
Twisters-yes.
Twisters and tornadoes are different terms used to describe the same weather phenomenon: a rotating column of air in contact with the ground. There is no difference in strength or power between these two terms.
There is no way for people to cause tornadoes.
Tornadoes are sometimes called twisters.
Tornadoes in the United States are simply called tornadoes. In informal contexts they are sometimes called twisters.
Tornadoes are often called twisters.