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5. Can Identical Twins be Both Cousins and Siblings? – Yes!
If male identical twins marry and have children with females that are also identical twins, their kids will be both cousins and full siblings. This may sound confusing, but the fact is that children born from their pairings will be legal cousins and genetic full siblings. Two children are considered genetic siblings if the new chromosomes that each child receives come from the same genetic pool.
6. It’s Nearly Twice as Common for Twins to be Left-Handed than Single Individuals
Why most people become either right or left-handed is still pretty much up for debate among scientists. There are some interesting statistics among twins, however, that shed some light on this subject. Left-handedness occurs in only about 10 percent of the overall population. Amazingly, being left-handed occurs at a much higher rate in twins. This may be due, at least in part, to the fact that about 25 percent of all twins are mirror twins and that mirror image twins are exact reflections of one another as discussed previously. This means that for every set of mirror image twins one of them will be left-handed.
Read interesting facts about Left-Handed people here.