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Joaquin Phoenix has three brother-in-laws.

His 'celebrity' brother-in-law is actor Casey Affleck who is married to Phoenix's youngest sister, Summer.

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More answers

Joaquin Phoenixs older brother was the late Oscar nominated actor, River Phoenix.

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14y ago
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joaquin Phoenix

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13y ago
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Joaquin Phoenix.

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9y ago
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Q: Who is River Phoenix's brother who is also an actor?
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