Dina Tribbiani is one of Joey's sisters. She is the youngest of the Tribbiani Sisters. Joey described her as his smartest relative, she took the SATS and did two years of college. As of 2001, she had sex with her boyfriend, Bobby Corso and got pregnant.
In the official subtitles, Dina appears as "Deena", but in the credits, is correctly written as "Dina"