Actually, given his age and the fact that he KNOWS that Estrella has already died, that means he realizes that she's not a living being, but rather a corpse that is acting as if she's alive.
If Estrella really is basically a zombie, then that's really sad... it means that she died without ever having met her father and siblings. I hope that her revival was a complete one and this isn't some temporary thing, so her 2nd life is good.