Twins with Two Fathers
Twins with two fathers are possible with supoerfecundation and superfetation.
Superfecundation and Superfetation and two rare events. Superfecundation
is when there are twins from ovulation on the same day with two separate fathers and superfetation
happens if there is a second pregnancy from two separate ovulations weeks or months after the first.
Twins with separate fathers is called Superfecundation. For this to happen, two things have to happen:
1. You have to ovulate twice (dizyogtic).
2. You have to have sex with different men within a couple of days of ovulation.
This can be either on the same day or some days, as sperm can survive for many days. Multiple ovulations happen in about 1% or more of all ovulations, more often so when you take ovulation-inducing medications.
Superfetation on the other hand happens when a woman gets pregnant after he implantation of one fetus and she again ovulates several weeks or even months apart and gets pregnant again. The result is that one fetus is more advanced in pregnancy then the other. This is an extermely rare event in humans and has been reported only a few times. Superfetation can happen with the same father or different fathers.