A full brother or sister.
Genetically, brothers and sisters from the same parents.
General term for brothers or sisters who share the same two parents, through birth or adoption. Siblings who share only one parent are called half-brothers and half-sisters; stepbrothers and stepsisters are those who have no relation through biology or adoption except that a parent of one is married to a parent of the other. Such various relationships have complicated even further the traditional rivalry between siblings for parental attention, power over each other, or any of the myriad other reasons that children find to fight with each other.
One of two or more children who have both parents in common.
A brother or sister. Sibling rivalry is the term applied to the intense competition that sometimes occurs between brothers and/or sisters. The birth of a new baby in the family may prompt jealousy and rivalry that can persist throughout life.
One of two or more children of the same parents; a brother or sister.
A brother or sister related to another brother or sister by blood, the marriage of the individuals’ parents, or adoption.
One of the offspring from the same parents; a sibling, which can be either a brother or a sister.