Over time the younger brother will develop the good actions of the older brother as well and be like him. Aristotle says "by imitating and reenacting the acts of good people, a child becomes habituated to good action". įor 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. "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". The relationship of brothers is laid out with the following quote: The book Nicomachean Ethics, Book VIII written by Aristotle in 350 B.C.E., offers a way in which people should view the relationships between biological brothers. 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 chromosomes. Some analyzers have suggested that a man's attractiveness to a heterosexual woman may increase with the more he resembles her brother, while his unattractiveness may increase the more his likeness diverges from her brother. Research also suggests that the likelihood of being gay increases with the more older brothers a man has. Some studies suggest that girls having an older brother delays the onset of menarche by roughly one year. 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. The cause of this phenomenon in which sibling warmth is only correlated with risk taking behaviours in brother pairs still is unclear. 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. Sibling warmth, or sibling affect between male siblings has been correlated to some more negative effects. The term brother comes from the Proto-Indo-European *bʰréh₂tēr, which becomes Latin frater, of the same meaning. Grave stele of brothers Eukarpos and Philoxenos of Miletus 2nd c.