Yellow Kazooie is in Brazil, which provides universal, free healthcare to its citizens, so your concerns about possible consequences for his insurance are misplaced. Although the symptoms he describes may be of no significance, they also could well be early signs of incipient schizophrenia or of some neurological problem. Even if they are caused by normal nighttime noises, the fact that he spontaneously interprets these as his parents’ voices is concerning. I agree with the majority of posters in this thread that he should talk to a doctor about these symptoms, and get tested if necessary. They could be early signs of serious diseases, that can be treated far more effectively if caught at an early stage than if left to develop into something more obvious. On the other hand, if, as is quite likely, they turn out to be harmless, nothing will have been lost.
Your (Senegoid) paranoid notions about psychiatry strike me as not very different from the delusions of anti-vaxers (or Scientologists, perhaps). There is always a very small chance, in any dealings with any branch of the medical profession, that one will be misdiagnosed and harmed by the treatment, and psychiatry is no exception in this regard, but I very much doubt your claims that psychiatrists are systematically inclined to diagnose problems where none exist. The dangers of not seeking medical advice for worrying symptoms far outweigh the danges of seeking it. If anything, the real problem for patents seeking mental health care when suffering relatively mild symptoms is the reverse of what you imply. Patient complaints about mild psychological symptoms are often too readily simply dismissed, or else treated perfunctorily with anti-depressants (which, I note, Yellow Kazooie is already on) in lieu of a more careful diagnosis or more appropriate but more expensive treatment. Anti-depressants are usually pretty harmless, but they also very often do not really do any good.
To imply to a person who may actually be showing early symptoms of serious mental illness (and certainly has genuine concerns that he may be), that if they mention their concerns to a doctor they are soon likely to find themselves involuntarily incarcerated in a lunatic asylum, even though they may be perfectly sane, strikes me as highly irresponsible. One Flew Over the Cuckoo’s Nest was not a documentary.