Given identical twin males, Michael and Douglas, Douglas and his wife have four children, all of whom are girls. Michael and his wife have only one child, a boy, and are expecting another. What are the chances it will be another boy? If Michael and his wife have more children, what are the chances they will all be boys? Is there any support/evidence for, or a study about, one twin of an identical pair will have children all of the same gender and the other twin will have children all of the same (or opposite) gender?
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