DNA ancestry is not always the same for siblings or even twins

I cut out the authorship of this post, because it advertises for us to have our DNA tested. I figure that's up to the individual to search, if interested.

DNA ancestry is not always the same for siblings or even twins to be precise. That's what siblings Kat and Eddy Abraham got to know after they did a genetic ancestry test.

HERE'S WHAT HAPPENED
As a birthday gift for their dad, the brother-sister duo decided to go through a DNA ancestry test which turned out to be a surprise for not only the historian of the family (their father) but also themselves.

THE RESULTS OF THE GENETIC ANCESTRY TEST
According to National Geographic, their father's side of the family is Lebanese and their mother's family is, as Kat describes her, some variety of white Canadian. The sibling duo expected the results to be same with both of them turning out to be half Middle Eastern and half European.

However, the results revealed Kat to have a 13 percent genetic ancestry form Italy and Greece whereas Eddy had 23 per cent.

WHY DNA ANCESTRY ISN'T SAME FOR SIBLINGS OR EVEN TWINS
It is a common misconception among people that children inherit their DNA from each parent in a 50:50 division. The DNA ancestry of a person can change with only slight variation in the DNA of egg (from mother) and sperm (from father).

THE SCIENCE BEHIND WHY THE SPERM AND EGG DNA VARY
The cells engage in some reshuffling known as genetic recombination every time the body creates eggs or sperm. Quoting National Geographic, "This process cuts the number of chromosomes that normal cells have in half -- from 46 to 23 -- so that when a sperm and egg combine during fertilization, they form a complete genetic package."

"To do this genetic trimming, the chromosomes in cells line up in pairs and exchange bits of genetic material before forming an egg or sperm cell. Each mature egg and sperm then has its own specific combination of genes which means offspring will inherit a slightly different set of DNA from each parent."