Based on the few hours that I spent with the PS1 version and PSP remake, the family is cursed to age faster and die in a few years. They also cannot reproduce (? Correct me if I'm wrong) so the only people they can reproduce with are deities. So you choose which ever family members you want to breed with deities (at some cost, more powerful deities cost more). There are both male and female deities and the leader of your family can be either male or female. You also forge heirloom weapon (s). Basically you build up your family by training, breeding and letting older members die and slowly make your way through the dungeons and plot. The actual character is the family itself, along with some immortal npcs.