Hi Stenka I see no reasonable need for the past perfect at all. In fact, you could easily write the end of that sentence with the simple present tense: Yesterday, your son sounded like he always sounds .
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to me, it should be "he had always sounded" because the tense of the main clause is past (sounded)It does seem that way, but the conventions of tense sequence are broken when comparing one time period to another. Here you're comparing "yesterday" to "always", using the comparative term "like".