Mountain gorillas, who live in close-knit social groups with siblings and non-siblings of both sexes throughout their lives, show distinct behavioral biases towards maternal versus paternal kin.

A novel statistical framework and approach using sibling phenotype pairs allows inference of genetic architecture in the tails of complex traits to be made without genetic data.

Patients diagnosed with a cardiovascular disease are at higher risk of psychiatric disorders, independent of familial factors shared between full siblings and comorbid conditions.

In wild bonobos, sibling birth induced a sudden increase in urinary cortisol levels in the older offspring, a physiological response that occurred in all subjects and was independent of their age.

A large-scale, sibling-based analysis of the Icelandic population spanning two centuries demonstrates an increase in maternal mortality rates after child loss on both sides of a major demographic transition.

A motor protein called Klp10A ensures that germline stem cells in male fruit flies divide to produce two sibling cells that are equal in size.

Gestational exposure to landscape fire smoke harms maternal health, especially in low and middle-income countries.

Findings of this population-based sibling-matched cohort study corroborate an association of loss of a co-twin at birth with risk of psychiatric disorders, supporting the hypothesis of twin-bond development in utero.

A population-based analysis demonstrates that surviving twins who lose their co-twins by death are at considerably elevated risks of developing psychiatric disorders.