Since then, each part has introduced a new Joestar who, while they may have a righteous heart, aren't exactly paragons of justice. At least for audiences, the Joestar family tree ended in Part 6 ...

Norisuke II was Norisuke's first son and is first mentioned in Chapter 11, "Family Tree ... of Jojolands, Part 9 of Jojo's Bizzare Adventure. One was in 2005, Dragonia Joestar, and another ...