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По-моему, тире тут вполне допустимо.
А вот слово "очень" - лишнее.

Who says something against that? I just say that Сергеев means Sergey's and not Sergey's son.
But you can't assert so categorically that it was ONLY "son" and nothing more.


Of course, in...

Exactly, Sergeev syn means Sergey's son, but Sergeev means just Sergey's. That's the difference.
The man who was called "Sergeev" could be Sergey's son or Sergey's servant, or other.