Shari Redstone, has clashed with her cantankerous father Viacom Inc. (NYSE: VIA) Chairman Sumner Redstone over the future of the family's National Amusements theater chain and plans to leave the media company's board, according to the Wall Street Journal.

Sumner Redstone wants to cash out of the theater business and focus on casinos while Shari Redstone is "confident" in the future of the business, the paper said. But for VIacom, there is more at stake than just family pride. The 84-year-old Redstone has no designated successor which raises questions about the future of Viacom because to put it bluntly the tycoon isn't going to live forever.

Shari and Sumner Redstone are far from the only family fued at large media companies. In fact, Redstone has also had a falling out with his son Brent who later filed suit and got bought out of the family business, something which his sister also wants, according to the Journal.

News Corp. (NYSE: NWS) CEO Rupert Murdoch has had a rocky relationship with his children. Of course, the Bancroft family that controls Dow Jones & Co. (NYSE: DJ) has been squabbling about Murdoch's efforts to buy the publisher of the Journal. Then there's the Dolans of Cablevision Systems Corp. (NYSE: CVC) whose family fights are always entertaining.

There are exceptions. The Washington Post Co.'s (NYSE: WPO) Grahams seem to be a content lot and with Warren Buffett helping run their family business who can blame them. The Sulzberger clan of the New York Times Co. (NYSE: NYT) also seem to keep their dirty laundry private. Comcast Corp. (NASDAQ: CMCSA) Chief Executive Brian Roberts and his father Ralph, who built the cable empire, seem to get along just fine as well.

But unless Dr. Phil can bring father and daughter together, the Viacom fight won't be solved any time soon. That's reason enough to avoid the stock.