Images or animations depicting two characters who are twin siblings, which come in two varieties.

Fraternal twins are the result of two eggs being in the womb at the time of conception instead of one, with both being fertilized simultaneously. These siblings can be wildly different, even opposite genders, and are no different than any other pair of siblings, except that their births were minutes apart instead of years.

Identical twins, the more commonly-tagged variety, are the result of a fertilized egg separating completely during cell division. The resulting siblings are essentially two copies of the same person, and are always the same gender, and look extremely similar visually. Differences between them form much later in development, such as minor differences between their fingerprints.

• Twincest - a form of incestuous art specifically focusing on twin siblings having sex.
• brothers
• sisters
• brother and sister

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