Twin cousins explain how they are also brothers

How similar are fraternal twins? 

Fraternal twins are no more genetically similar than any other pair of siblings who share biological parents.   That’s because each egg and each sperm contain different genes, Dr. Peskin explains. The genes in each egg and each sperm are some combination of the genes inherited from parents.   So, one fraternal twin can have genes for blue eyes and dimples while the other is brown-eyed and dimple-less.   Fraternal twins may or may not be assigned the same ... at birth. That means fraternal twins could be two boys, two girls, or one boy and one girl.