The souls of 2 individuals?

If those are say, you and I, or you and the parent comment, how are they seperate?

We're experiencing identical perception right now, me in the form of reading the words you wrote, and you in the form of reading these words. The words are just information which is now duplicated in both our minds. When the psychedelic "everything is connected" concept is brought up, this is what is meant. Its not some new magic that has been discovered, its realizing that the mundane everyday mechanics that allow our reality to function, are in fact quite magical, not mundane at all. But anyone can still choose to see it as mundane, its just a choice of lens.

That's the most prevalent modern Christian view but many traditions have some version of monopsychism, where the many souls are a manifestation of the one God, or Allah, or Brahman, or Buddha-nature

Dualism is one of the stupidest concepts ever imagined.

That assumes that a "soul" is a real thing.