I found this experiment mind blowing (Can Previous Mating Partners Influence The Traits Of Future Offspring?):
Perhaps not surprisingly, DNA paternity analyses confirmed that the most recent male partner had indeed sired the offspring in the vast majority of cases. However, the scientists also found that the size of the offspring was strongly related to the size of the female’s first mating partner. At the same time, offspring size was unrelated to the size of the most recent partner, even in cases where there was definitive evidence that the most recent partner was the father. That’s right—the young flies tended to look more like mom’s first mate than they did their dads.
As mentioned in the article we may have a lot more to learn about how traits are inherited.