That Nancy Bush question hits home because I just finished rereading 'The Killing Game' last month. For themes of family and identity, I'd point you toward her Jane Kelly series, starting with 'Candy Apple Red'. It's more than a mystery; it's about Jane, a process server, piecing together her own fractured family history while untangling other people's secrets. The whole series feels like a long, messy conversation about who we are versus who our families tell us we should be.
Her standalone 'Blind Spot' also fits. The protagonist literally has to reconstruct her identity after amnesia, but the real tension comes from the family she can't remember and whether she trusts the memories they offer. It’s less a whodunit and more a 'who-am-I', which Bush handles with a lot of psychological unease. The family dynamics in that one are claustrophobic and loaded with quiet betrayals, which makes the identity quest feel genuinely urgent.
Her older romantic suspense novels, like 'Unseen', weave identity crises into romantic plots, but the newer thrillers dig deeper. If you want the full thematic punch, the Jane Kelly books are where the exploration feels most sustained and personal.