Learn what "someone walked in" means, when people say it, and how to use it naturally in English.

It means someone arrived and said he was the man's son after being absent for a long time.
From Good For Him, Episode 20
Someone reports that a man arrived claiming to be the person's long-lost son.
Use this to describe an unexpected family claim or reveal. It is more of a plot description than a reusable English phrase, so it should not be indexed as its own phrase page.
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