Learn the tone, meaning, and better English alternatives around "are the only" with real scene examples.

It means this person is trusted because they are expected to keep something confidential from the speaker’s father.
From The Escaping Mistress, Episode 20
The speaker is explaining why this lawyer is the only person they trust with a secret from their father.
Use this when explaining why you trust someone with sensitive information. It sounds natural in serious or secretive situations, but it is not a common standalone idiom.
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