1. Danica McKellar almost wasn't Winnie Cooper
It's hard to imagine anybody but Danica McKellar being the object of Fred Savage's affection on "The Wonder Years." But the young actress had some stiff competition for the role of Winnie Cooper -- from her own sister. According to an interview with the L.A. Times in 1990, a then-15-year-old Danica explained that the final two candidates for the part were her and her young sibling Crystal.
Even casting director Mary Buck admitted that "it was practically a tossup." In the end, Danica prevailed. Crystal did get her time to shine on "The Wonder Years," though, playing Kevin's other love interest, Becky Slater, in 10 episodes.
That wasn't the show's only bit of nepotism. In the Season 3 installment "The St. Valentine's Day Massacre," Fred's little brother, Ben, played Cupid. Of course, Ben would go on to score his own sitcom, "Boy Meets World." Now he is set to reprise the role of Cory Matthews in the upcoming sequel, "Girl Meets World."