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There is no simple answer to the question because
the children's genders are not independent events.
They depend on the parents' ages and their genes. Unfortunately there is no readily available research into the genders of seven or more children to establish
the experimental probability for such an outcome.
However, if you assume that they are independent events then, given that the
probability of a girl is approx 0.48, then the probability of the seventh child being a girl is 0.48.