If you saw people who were dead and alive, you didn't.

Musket, you strive to prevent absurd notions from growing legs. Let me remind you, as amply stated in many texts for decades, that if being alive were an elementary quantum property, there would be beings that are dead at a given time, beings that are alive at that time, and beings of indeterminable life status, all three perfectly observable per se, but the latter neither dead nor alive, at any time! Trying to apply a device for measuring the life status of "such" a being amounts to it not being of that type at all, but either dead or alive. "Collapsing the wave function" is just a sloven way of speaking for the "wave function" never having existed independently of the measuring device.

I read about that the double slit experiment. If I understood correctly, the theory can describes it and predict the results exactly, it just has no "explanation" conforming to the everyday intuition of humans including physicists.

Correct me if your son tells you I'm wrong.