Sheen's father, actor Martin Sheen, told Sky News earlier this week he likened Sheen's addiction to having cancer.

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Johnson inherited Sky Angel from his late father, Robert Johnson Sr.

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It all began last year with a father-son excursion to see the rocket-loving film October Sky.

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Obama's father's absence, on the other hand, could be credited in part for his sky's-the-limit style that helped him win the 2008 election.

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