Twins are 2 people with the same set of genes if identical, but they can also be unidentical and of the opposite sex to each other. A lot of the time twins think that because they have each other they don't have to tell their best friends their secrets and problems. Often one twin overpowers and takes control of the other twin and therefore in schools they are often separated so they can grow as induviduals, but when this doesnt happen they can often bully and intimidate others. These are often the sets of twins that grow into old age living in the same house and dressing in the same clothes.
Mary-Kate & Ashley Olsen are identical twins
When people are separated in schools they are in separate classes and never share the same class and classmates