Sam and Alex are first cousins. Lee and Morgan are twins. But Sam and Alex are more closely related to each other than are Lee and Morgan, in terms of genetics. How did this happen?
Good luck! :tongue2:
Allex' mother and father are, respectively, Sam's mother's identical twin sister and Sam's father's identical twin brother. The twins are fraternal twins, by definition could have different fathers.
Fraternal twins are Lee and Morgan. Sam and Alex resulted from incest where their father impregnated both of his twin sisters. Nevertheless, I'm assuming there is more than one answer to that riddle.