Fraternal Twins Can Have Different Biological Fathers

Question

Fraternal twins can have different biological fathers.

Accepted Answer

Fraternal twins can be conceived when two different eggs are fertilized by two different sperm. Therefore, it is possible for each twin to have a different biological father if the mother had sexual intercourse with two different men around the time of ovulation. This phenomenon is known as heteropaternal superfecundation. However, this is extremely rare and only about 1 in 13,000 fraternal twin pregnancies have different biological fathers.