Brother redirects here; for the DIS episode of the same name, please see "Brother".
Sister redirects here; for the religious titles, please see Brother (title) or Sister (title).
"The only thing I regret is not being an only child."

In a family, a sibling was an offspring born from the same parent or parents as another offspring. (DS9: "Family Business") In the case of multiple births, more than one sibling (i.e. twin, triplet, or quadruplet) were born at one time. (DS9: "Vortex", et al.)

Trill symbionts had to move on from their previous hosts' lives, even forgetting any siblings the host may have had. (DS9: "Rejoined")

In 2153, Doctor Phlox asked T'Pol if she had any siblings. This was done as a prelude to soliciting her help with Trip Tucker, who was grieving the loss of his sister Elizabeth in the Xindi incident. (ENT: "The Xindi")

Haliz recruited Kazon to be fighters as soon as they were old enough to protect their younger siblings. (VOY: "Initiations")

As of 2374, the crew of USS Voyager knew little about Annika Hansen, such as whether she had any siblings. (VOY: "The Gift")



The male sibling was known as the brother. (TOS: "What Are Little Girls Made Of?", et al.) In the Ferengi language, the term was translated as "yoba". (DS9: "Little Green Men")

A child who has a brother shared through one parent was known as a half-brother. Spock and Sybok were half-brothers; both were sons of Sarek, but both had different mothers. (Star Trek V: The Final Frontier)


The female sibling was known as the sister. (Star Trek II: The Wrath of Khan, et al.) A sister who was not biologically related but rather by marriage was known as a stepsister. (TNG: "Parallels", DS9: "The Magnificent Ferengi") Ships that were similar to each other were, in keeping with the tradition of referring to a ship as a "she", known as sister ships.


List of full siblings

List of multiple birth siblings

List of half-siblings

List of fictional siblings

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