Priestley juxtaposes that the rest of the family that were acting were in the clear due to Gerald finding out and announcing that the Inspector wasn't real.
He mainly presented them in an irresponsible manner to varying extents which shows that Inspector is not irresponsible at all.
Hence, he juxtaposes the rest of the family, as they were acting like they were in the clear due to Gerald finding out and announcing that the Inspector wasn't real.
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