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POPSAre you my sister or my daughter? Although this story makes me feel uncomfortable, there have been plenty of cases where orphaned children are brought up by their older siblings who act as surrogate parents. And likewise, plenty of cases where grandparents bring up their grandchildren effectively acting as their parents. Sometimes the children are even deceived into believing their mothers are their sisters. The family relationship quagmire is nothing new although this use if IVF technology is definitely unusual..