Brother
A male sibling sharing one or both parents.
A brother is a male sibling—a boy or man who has at least one parent in common with another person. The equivalent female sibling is a sister. While the word usually describes a family connection, it can also be used affectionately for close non-family bonds. A full brother is considered a first-degree relative.
The word *brother* traces back to the Proto-Indo-European root *bʰréh₂tēr*, which evolved into the Latin *frater*, meaning the same thing. Research has found that warmth between brothers is linked to more risk-taking behavior, a pattern not seen in other sibling pairs. The reason for this is unknown, but it suggests that while sibling conflict raises the risk of risky behavior, sibling warmth does not protect against it. Some studies indicate that having an older brother can delay a girl’s first menstruation by about a year. Other research suggests that the more older brothers a man has, the higher the likelihood he will be gay. It has also been proposed that a woman may find a man more attractive if he resembles her brother, and less attractive if he does not. Girls with a twin or very close-in-age brother sometimes see him as a male version of themselves, or what they might have been like with a Y chromosome.
In his book *Nicomachean Ethics* (Book VIII, written around 350 BCE), Aristotle described the relationship between biological brothers. He compared it to friendship between comrades or people who are alike, noting that brothers belong to each other more, are born with love for each other, and, having the same parents and upbringing, tend to share similar character. He argued that an older brother should set a good ethical example for his younger brother. By imitating the good actions of the older brother, the younger brother develops good habits, which become hard to break once established. Thus, the older brother plays a key role in shaping the younger brother’s moral education.
- term_origin
- Proto-Indo-European *bʰréh₂tēr, Latin frater
- field
- Familial relationship
- known_for
- Male sibling; first degree relative
- related_term
- Sister
- types
- Full brother, stepsibling
Lore & Background
The term brother comes from the Proto-Indo-European *bʰréh₂tēr, which becomes Latin frater, of the same meaning. Sibling warmth or affection between male siblings has been correlated to some more negative effects. In pairs of brothers, higher sibling warmth is related to more risk taking behaviour, although risk taking behaviour is not related to sibling warmth in any other type of sibling pair. The cause of this phenomenon in which sibling warmth is only correlated with risk taking behaviours in brother pairs still is unclear. This finding does, however, suggest that although sibling conflict is a risk factor for risk taking behaviour, sibling warmth does not serve as a protective factor.
Reader's Guide
The relationship of brothers is laid out with the following quote: 'The friendship of brothers has the characteristics found in that of comrades and in general between people who are like each other, is as much as they belong more to each other and start with a love for each other from their very birth, and in as much as those born to the same parents and brought up together and similarly educated are more akin in character; and the test of time has been applied most fully and convincingly in their case.' For these reasons, it is the job of the older brother to influence the ethics of the younger brother by being a person of good action. Aristotle says 'by imitating and reenacting the acts of good people, a child becomes habituated to good action'. Over time the younger brother will develop the good actions of the older brother as well and be like him. Aristotle also adds this on the matter of retaining the action of doing good once imitated: 'Once the habits of ethics or immorality become entrenched, they are difficult to break.' The good habits that are created by the influence of the older brother become habit in the life of the younger brother and turn out to be seemingly permanent. It is the role of the older brother to be a positive influence on the development of the younger brother's upbringing when it comes to the education of ethics and good actions. When positive characteristics are properly displayed to the younger brother by the older brother, these habits and characteristics are imitated and foster an influential understanding of good ethics and positive actions.
Did You Know?
- Some studies suggest that girls having an older brother delays the onset of menarche by roughly one year.
- Research also suggests that the likelihood of being gay increases with the more older brothers a man has.
- Females with a twin or very close-in-age brother sometimes view him as their male alter ego, or what they would have been like if they had a Y chromosome.
- In pairs of brothers, higher sibling warmth is related to more risk taking behaviour, although this is not found in other sibling pairs.
Frequently Asked Questions
What is a Brother in the context of Human Relationships and Life Stages 1-24?
A Brother is a male sibling who shares at least one parent with another person, making him a first-degree relative. The term covers both full brothers (sharing both parents) and half-brothers (sharing one parent).
Where does the word 'Brother' come from?
The term traces back to the Proto-Indo-European root *bʰréh₂tēr and passed through Latin as frater before entering modern English. It has been used across Indo-European languages to denote a male sibling for thousands of years.
What types of Brother are recognized in this framework?
The primary category is the full brother, who shares both parents with a sibling. A stepsibling relationship is also acknowledged, where the bond is formed through a parent's remarriage rather than shared biological lineage.
What is the female counterpart to Brother?
The female equivalent is a sister, who holds the same first-degree relative status within the family structure. The two terms are paired as the male and female designations for a sibling relationship.
Can 'Brother' be used outside of a literal family relationship?
Yes, the word is sometimes applied endearingly to close friends or community members who are not biologically related. In that figurative sense, it signals a bond of loyalty and closeness that mirrors a familial tie.
More in Human Relationships And Life Stages 1-24
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record