His wife isn't immediately related to him unless they got married in west virginia. Kim's still alive too.
Hey, anything's possible!
Don't worry, Kim will bite it soon enough. Or maybe she'll end up being the Bauer that carries on the legacy after she (hopefully) buries her father next season.
Or maybe they'll both die.
Still have to kill Josh, too. Maybe he's the one to whom the torch will be passed. Before he's killed.