One started with him hiding in a nursing home, after faking his death. I don't recall specifics, but I suppose that it's possible that all of the other characters are his descendants. And they had spent a long time looking for him.
In the other, he'd been resurrected by some godlike AI as a meatspace agent. Millennia after the Qeng Ho era, I think.
Humans just aren't wired to consider family members beyond 3 or 4 generations up and down.
Perhaps I'd feel the same general apathy as Pham Nuwen 20 generations down. Then again, he had other familial issues that played a part.