The sentence is in the passive. " Informed is a transitive verb, and it remains transitive in the passive. The grammatical subject of the clause, "his relatives," are still the recipient of the action of informing.
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Is it not the case when judging the transitive and intransitive nature?No. As I explained, you look at the sentence, or listen to the sentence, not look in the dictionary!
Are you forced to look at a dictionary [ ? ]