one more comment re: dna. I tested at 23andme with my sister. we
have 54.92% dna in common-just over half. she shares with many
different cousins and some cousins in common. siblings can share
between around 42% to 100%-the highest usually being identical twins.
there is a specific varient among humans that can leave children not
matching their parents and visa versa. the parent is called a chimera.
they are twins that never seperated. though it sounds strange it's
been scientifically proven to be true fact.
here's the wiki on chimera's.
http://en.wikipedia.org/wiki/Chimera_(genetics [1])
the parent's dna doesn't show up in the child, an uncle or aunt's
dna does. so it looks like an NPE, when in fact they were born by the
chimera.
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[1]
http://en.wikipedia.org/wiki/Chimera_(genetics