Graziella Trikonis (Makenzie Ryan) is Riff's/Diesel's girlfriend. She was born December 26th 1939. This makes her 16 by the time the show happens
In 1953, she met a man named Diesel who she started dating. After Riff’s death her and Diesel broke, up, married, divorced 3 times, but ended up dying together in 2001 during 9/11 while they were on a plane to LA for their 37th anniversary.