Ms. Redstone is the widow of Mr. Redstone's brother, Edward Redstone, who died in late 2011.
Madeline Redstone, sister-in-law of media mogul Sumner Redstone, has put her Rancho Mirage, Calif.
They both married much younger women, though Redstone and his second wife have since divorced.
Today, the company he owns with Shari Redstone, Rising Star Media, has 75 screens in Russia.
Vistar backers include Valhalla Partners and Advancit Capital, the investment firm co-owned by Shari Redstone.
Together that pair of entrepreneurs, along with Matrix, developed Redstone Communications, which makes routers.
But the biggest obstacle is likely to be Mr Redstone and Mr Karmazin themselves.
If Mr Redstone is not the ideal boss, neither is Mr Karmazin the perfect subordinate.
Redstone didn't address Freston's decision to hire former manager Brad Grey to run Paramount.
Now Freston is out, replaced by longtime Redstone associates Philippe Dauman and ThomasDooleyThomas Dooley.
She is the widow of Mr. Redstone's brother, Edward Redstone, who died in late 2011.
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The Redstone family battle centers on a rift between Sumner and his 54-year-old daughter, Shari.
Sumner Redstone wants to be remembered not for his feuds but for the empire he built.
Now Freston is out, replaced by longtime Redstone associates Philippe Dauman and Thomas Dooley .
All the more reason for Sumner Redstone, Jeffrey Immelt and Gerald Levin to be interested.
Redstone has been chairman of CBS since it and Viacom split apart in 2005.
Madeline Redstone, sister-in-law of media mogul Sumner Redstone, has listed her Rancho Mirage, Calif.
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Viacom owns Paramount Pictures, but is controlled by Sumner Redstone's closely held National Amusements Inc.
Next up, Redstone and President Mel Karmazin say they are on the prowl for cable networks.
" The Redstone saga, Coffee adds, "sounds like the plot of King Lear, brought up to date.
Sumner Redstone vows to sit down with his daughter in the coming weeks to resolve their differences.
Redstone controls 80% of National Amusements, a private company that owns movie theaters in the U.S. and abroad.
The Dauman-Dooley team were brought back by Redstone after he summarily fired Tom Freston from the CEO post.
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Sumner and his younger brother, Edward Redstone, grew up in Boston, born to Belle and Michael (Mickey) Redstone.
Edward Redstone was a partial owner in National Amusements, the family's exhibition business, for more than 22 years.
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On paper, at least, Freston seemed to have delivered what Redstone expected when he split up his company.
"There is nothing wrong with control as long as it's used for the good of the companies, " Redstone says.
Mickey Redstone owned three drive-in theaters, and Edward already was working for him.
Redstone says the language of his succession promise is "ambiguous, " but clearly he frets that it could hold some sway.
The most obvious culprit is Viacom's stock price, down 15% since Redstone split his media conglomerate into two in January.
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