Why was Ron Goldman's family much more aggressive in pursuing legal action against OJ after the trial than Nicole's family?

Something I've always wondered about, but it appears that all civil lawsuits and actions that followed OJ for the rest of his life following the murder trial were spearheaded by Ron Goldman's family (specifically his father) while Nicole's family, the Browns were part of the wrongful death civil suit but took no further action against OJ while the Goldmans continued to go after him at every legally available opportunity, especially regarding the book he tried to release. Why was this?