uite am gasit pe internet o chestie interesanta, citez din articol in engleza, care arata ca este totusi posibil si asta, doar ca e vorba de ovulatii in cicluri diferite.
In general, fraternal twins are the result of two eggs released within the same 24 hour period and then fertilized by two different sperm. However, in superfetation, a mother releases one egg, gets pregnant, and then releases another egg in a different cycle--her cycle not stopping during pregnancy the beginning of pregnancy. If both eggs are fertilized, this results in twins that have different gestational ages.
si tot in acelasi articol in engleza, am aflat ca este posibil chiar ca o femeie sa aiba gemeni cu tati diferiti
Superfecundation is the technical term for twins who have two different fathers. In this case, a woman released two eggs and then had sex with two different men, each of whom had sperm that fertilized one egg. Superfecundation is rare, mostly because most people do not have sex with multiple partners during a twenty-four hour period.