Why children have different personality in a family? They living in the same environment, some children even share the same genes. However, the order of they came to this world decided the character of each one.
In recent years, the Harvard University historian and psychologist Frank Sulloway, tested this argument in 894 scientists, 893 members of the French National Assembly, 62 leaders of the reform movement in the United States, as well as 700 people of the Protestant Reformation in Europe in order to use this theory to more areas.
Sulloway suggested, the eldest children are more diligent, responsible and conservative, they tend to be successful in life; later-born children are more likely to accept radical and innovative thinking and more likely to become rebels. For many parents, this theory sounds true. The author of the book Sibling Rivalry, Dr. Richard Wolfson -a child psychologist, said: "There is evidence show that birth order do influences personality, and common sense tells us this is true. Sulloway leads this theory to an extreme. "
Sulloway concluded that the point is that the eldest children treated with favour from parents, they tend to maintain the status so that they respect for authority. Sulloway said in an interview on the Internet: in general, the eldest children tend to prepared work diligently, and do better at school.
The later-born child have more difficult task, since the duty of responsible in the family has been taken by their older brother/sister, they either to compete for this position, or choose another way to find suitable position to avoid direct competition in their family. Sulloway said: "later-born children are more likely to accept radical innovation in the field of science and social.
I think people believe the theory because it is happened in real life, and we can confirm that in ourselves' family. Even there is some special case, the idea still supported by majority.