Virtual twins are children who are raised together, but have no genetic relationship. They are also very close to each in age, with most researchers defining virtual twins as children less than nine months apart in age. Virtual twins can come into a family in a wide variety of ways, and they are a topic of interest to psychologists and other researchers, as they can be used to delve into the relationship between environment and genetics.
So, I guess the next time somebody asks me if my girls are twins, I can just say yes and not try to explain the obvious---- that they're from different continents, are different ages, act nothing alike, and look absolutely nothing alike. ;-)
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