Multiple births In biology , the term multiple births referred to multiple sibling s born during the same pregnancy . The term twins referred to two siblings born from the same pregnancy . Three siblings born at one time were referred to as triplets , while four were referred to as quadruplets . These siblings could look alike or different and were often close in age , being born only moments apart . The species identified by Humans as Greek god s had twins . One example was Artemis , who had a twin brother Apollo . ( ) When Beverly Crusher was eight years old , she had a crush on an older child named Stefan . As her infatuation with him grew , she began to create the imaginary family the two had together in her head , which consisted of them being married and having three children : twin boys , Andrew and , and then later , a little girl , Jennifer . ( ) William T . Riker likened meeting his transporter duplicate , Thomas Riker , as being " a little like meeting someone ' s twin . " ( ) Curzon Dax once knew what were described as " gorgeous Ruji twin sisters . " ( ) Benjamin Sisko once mistook Nidell ' s psychoprojective alter ego , Fenna , as a twin sister . ( ) Twinned Miradorn s were not just twin brothers , but together , were a single self : two halves of one being . If one twin died , the other twin would anguish in the loss of self . Ah - Kel and Ro - Kel were an example of a twinning . ( ) Vilix ' pran began his budding , in 2371 , having his first set of twins . ( ) When Miles and Keiko O ' Brien were considering having their second child , Miles asked " " What do you say we try for twins . . . " " Keiko told him that " " I don ' t think that ' s the way it works " " and that " " you ' d better brush up on your biology . " " ( ) The Delaney sisters who served aboard were twins . ( ) In the 20th century Earth soap opera viewed by Neelix and Kes , Neelix expressed a desire to see if Blaine ' s twin brother was the father of Jessica ' s baby . ( ) Clone s could often be misidentified as twins , triplets , or even quadruplets . ( ) In Tom Paris ' adaption of The Doctor ' s holonovel " Photons Be Free " , where Seven of Nine was originally envisioned as Three of Eight , became re - envisioned a group of triplets : One of Three , Two of Three and Three of Three . ( ) " In the alternate reality , had an encounter with a pair of Caitian twins in 2259 . also mentioned having delivered a set of Gorn octuplets once . " ( ) Background information . Identical twins were prominently used in casting the episode . The use of these twins for each android " series " aided the photographic - effects budget for the episode . With imaginative use of twins and split screens , as many as six of one model were shown at once , while two of the same model required nothing but an additional costume . This ultimately gave the illusion of a planet of thousands of androids . ( " The Star Trek Compendium " ) Twins were also often cast in the role of a single young child character in order to respect child labor laws . These included Jessica and Vanessa Bova ( " Alexandra " , ) , the Tadeski twins ( " Molly O ' Brien " , ) , Candace and Nicole Villwock ( baby " Deanna Troi " , . ) , and Mathew Corley and Carolyn Corley ( baby " Miral Paris " , . ) In the case of the actors playing twin characters Azan and Rebi ( Kurt and Cody Wetherill ) , twin stand - ins ( Matthew and Nathan Kennedy ) were also used for shots from behind and partial shots for this same reason . Apocrypha . In the novel " Mission to Horatius " , ancient Vulcan s worshiped a god named Maripol , who caused earthquakes and floods . He could only be placated by sacrificing the hearts of twins . In the Pocket TOS novel " Savage Trade " , it was revealed that Vulcan twins shared a platonic mental connection that prevented them from developing a mating bond with another Vulcan . They could therefore have a relationship with whomever they wished . According to the eBook " The Cleanup " , 90 % of the Miradorn population consisted of telepathically - linked twins . According to the video game " " , Taurik and Vorik were twin brothers .