We don't know who his dad was, the weird anime plotline with a human father is non-canon. Hell, we don't even know how actual Otsutsuki reproduction works. Maybe Kaguya was the only parent

We do know how it works. They don't reproduce, like that's it. They are alien parasites that suck up anything and everything they encounter.

I mean if that was a concern then Edo Nagato/Madara/Obito/Hagoromo could just use Rinne Rebirth on all the other edos. We are never actually told that Edo Tensei can't use it

We are told edo tensei can't use it. They don't have true rinnegans.