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This study found that identical twins resembled each other twice as much as fraternal twins, due to genetic factors.
Furthermore, environment influences personality substantially; however, it has little to do with whether they are reared together or apart.
In most societies throughout the world, siblings often grow up together, thereby facilitating the development of strong emotional bonds.
The emotional bond between siblings is often complicated and is influenced by factors such as parental treatment, birth order, personality, and personal experiences outside the family.
Studies suggest that identical twins appear to display more twin talk than fraternal twins. Researchers were interested in subjects who were in the later years of life.