So...may not be a popular opinion...but here it goes.... We know that the Purge happened...and we can assume that there were a lot of dead Mandalorians...and that may also mean that named characters we saw onscreen may be dead as well.... I would like (storywise) that Sabine's parents are dead...killed in the Purge. But Sabine's history being as complicated as it is...working for the Imps and designing the weapon...combined with her coming back the Dark Saber and giving it to Bo-Katan to unify the Clans...has left her in this kind of cultural limbo with other Mandalorians. They warily accept her as one of them....but would not accept her as leader of her Clan. So she steps aside from that and her younger brother Tristan is leader of Clan Wren.