Edward says Sumner had undercut him at NAI, urging him to stay on but hiring someone else to do Edward's job.

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The first family feud came in 1971, when Edward sued Sumner and their dad to liquidate his 100 shares.

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In 1959 Mickey formed National Amusements and issued 300 shares: 100 for himself, 100 for Sumner and 100 for Edward.

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Sumner and his younger brother, Edward Redstone, grew up in Boston, born to Belle and Michael (Mickey) Redstone.

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By 1968 Mickey Redstone had sold half his stake back to NAI, and he created a trust and funded it with the other half, naming his four grandchildren as beneficiaries (Sumner's two kids, Brent and Shari, and Edward's two kids, Ruth Ann and Michael).

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