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You'll use an apostrophe s on the word son if you are showing possession or using a contraction.
Examples:
"That is my son's room."
"My son's out at the moment" -- This is a contraction of "son" and "is"
The duration of White Room - film - is 1.55 hours.
The Son of Tarzan - film - was created in 1920.
Son of Man - film - was created in 2005.
American Son - film - was created in 2008.