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1.
Twins that do not look alike.
Most people think of identical twins when you say twins, but twins are just people that are born on the same day (as you should know if you are over 6).

Because of that, fraternal twins do look a little like, but not enough to be considered twins. Often it is assumed that they are siblings of different ages or cousins.
"This is Jane Doe, she's my-"
"Sister?"
"Yeah...But she's also my twin."
"Oh really. Yeah, that's why you look different." *snorts and walks away*
(Joann and Jane Doe at the same time) "Bye, ignorant human being who acts like they are six!"
Mary-Kate and Ashely are idiots...And they are also NOT fraternal. At least not naturally.
by Carynne No. December 09, 2006
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