Sibling

A sibling is a relative that shares at least one parent with the subject. A male sibling is a brother and a female sibling is a sister. A person with no siblings is an only child. While some circumstances can cause siblings to be raised separately most societies have siblings grow up together. This causes the development of strong emotional bonds, with siblinghood considered a unique type of relationship unto itself. The emotional bond between siblings is often complicated and is influenced by factors such as parental treatment, birth order, personality, and personal experiences outside the family. Medically, a full sibling is a first-degree relative and a half sibling is a second-degree relative as they are related by 50% and 25% respectively.

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The Well Sibling Syndrome and its Mental Health Impact

Adjusting to a new sibling is highly stressful for bonobo infants

Study questions the role of vitamin D2 in human health but its sibling, vitamin D3, could be important for fighting infections

Study questions the role of vitamin D2 in human health but its sibling, vitamin D3, could be important for fighting infections

Privately-Funded Venus Probe Will Search for Life in Clouds of Sulfuric Acid on Earth’s Sibling Planet

Sibling bullying associated with poor mental health outcomes years later

Witnessing abuse of sibling can lead to mental health issues

Sibling's likelihood of autism diagnosis impacted by age gap, study finds