Fraternal and, especially, identical twins are famous for sharing close relationships. Are those relationships closer than those of other siblings? It’s a relevant question when the number of twins being born in the U.S. has increased dramatically due to the widespread use of fertility drugs -- 3.2 out of 100 births result in multiple babies. Debbie Ganz, who co-wrote a book on twins with her twin sister Lisa, says, “It’s not a normal relationship.” The personal accounts of twins show that their relationship can be much deeper and more idiosyncratic than those of siblings who don’t share the exact same birth date and time.
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