2.In this sense Parallel verse and the Multi verses exist simultaneously.
In the former, at our level of existence we have many possible worlds depending on our intent to perceive.
Also the Multi verse do have their Parallel verses depending on the ability of those who inhabit them to perceive.
So there are many Multiverses in each of the possible , including ours.
3.This raises some interesting possibilities.
a) If one were to go back in Time and sees himself in the past, what does it belong to?
Parallel or Multiverse?
b) Again, according to Hinduism Rebirth is certain.
Let us look some example.
I am 64 now.
I should have died at least sixty four years ago.
My children int he past birth must have cremated, buried my body and religious ceremonies should have been performed( It might nor have been performed as well).