Sisters are the best friend as well as mother most of the time. Sisters, especially when you have elder one then she would behave like our mother most of the time. When you have younger one then she would be your first child. Because you will be behaving like her mother.
But when you have twin sister, then she is your everything. World says, we come alone and go alone but you have twin then you come with your first and last enemy and bestie as well.