Correcting a NY Marriage Certificate/ Birth Certificate/ Death Certificate

[Poetry_to_read]

HI everyone
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So I decided to claim my Italian citizenship in Italy before i go to start my college years at a Studienkolleg. I was getting all my records together for NYC and NY and suddenly I realized i Had a problem. On my Great-grandfather's birth certificate and his mothers death certificate. she is 2 years younger than she is on her own birth certificate as well as her marriage certificate. Furthermore His marriage certificate butchered his name ( Gaitano Bellantoni became Gayten Belenton (i doubled check and his wife was definitely my great grandmother and there is a newspaper article proving it was them). I realized I am going to need to correct them before i go over there to apply. Does anyone know anything about how to do it youself. I called a company and they said it would cost 250 dollars a document minimum. Any advice would be loved

[qualdom]

Did your GGF get married in NYC? Another user here said that the NYC Marriage Bureau was willing to correct the old marriage record of a deceased relative even without a court order.