There's a principle that each child is trying to be different from the one immediately older, so if you had three middles, the first and third would likely be a bit more similar to each other than to the very middle child. Catherine Salmon More Quotes by Catherine Salmon More Quotes From Catherine Salmon Twins are the special focus of their parents, there's typically less competition between identical twins. Fraternal twins, however, behave more like other siblings. Catherine Salmon health-news Middle-borns don't have the rights of the oldest or the privileges of the youngest. Catherine Salmon health-news Parents are more lenient, so youngest kids tend to be less rules-oriented, and yet they still get lots of attention. Catherine Salmon health-news If the firstborn can't excel at what the family values, for example, that position could shift to another child. Catherine Salmon health-news If there's a high value being placed on one gender over the other, the dynamic gets disrupted. Catherine Salmon health-news