Back in August, The Hollywood Reporter spilled that Grey's Anatomy star Katherine Heigl and her mom, Nancy Heigl, had formed a movie production company. (We love our mothers, but the mere thought of working with them makes us shudder.) But that's just the next step for the mother-daughter team -- Nancy has been Katherine's manager for the past 10 years! How do they do it?! Alas, the Heigls are the exception that proves the rule -- momagers (and dadagers!) make the world nuts. Don't believe us? Check these nutty examples!

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