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A sibling is one of two or more individuals having one or both parents in common. A male sibling is a brother, and a female sibling is a sister.
In most societies throughout the world, siblings often grow up together, thereby facilitating the development of strong emotional bonds.
"Stepsiblings" (stepbrothers or stepsisters) are the children of one's stepparent from a previous relationship. "Foster siblings" are children who are raised in the same foster home, foster children of the person's parents, or foster parents' biological children.
Two "adoptive siblings" are raised by a person who is the adoptive parent of one and the adoptive or biological parent of the other.
Half-siblings are people who share one parent but not both.
They may share the same mother but different fathers (in which case they are known as uterine siblings or maternal half-brothers/half-sisters), or they may have the same father but different mothers (in which case, they are known as agnate siblings or paternal half-brothers/half-sisters.
Furthermore, environment influences personality substantially; however, it has little to do with whether they are reared together or apart.
This study also suggests that heritability is substantial, but not as substantial as for younger subjects; it has less significance later on in life.
Three-quarter siblings share more genes than half siblings, but fewer than full siblings.
Segal (1997) was interested in siblings of no biological relations.