Atman (soul in English) is an independent entity having no relationship with the other atmans souls whatever.
When an atman manifests a body it is called Jivatman and a body a Jiva. An atman is not different from Jivatman, both mean the same.
When a Jivatman, the atman soul exists on mother earth! When an independent atman soul (without a body) it hibernates in heaven or hell! Both heaven and hell existed in sun.
As a Jivatman the atman keeps rotating in endless cycles of birth and death. The occurrence of death of body on mother earth announces release of atman within. If this atman gets matching parents it immediately manifests a new body to start new journey of life on mother earth. In absence of matching parents the released atman hibernates in heaven or hell.
Sooner matching parents become available, the hibernating atman immediately manifests a new body to start new journey of life on mother earth. Every atman keeps manifesting body after body, manifestation after manifestation until it reaches state of absolute purity.
When an atman regains its lost original pure prime pristine primordial form, it announces liberation from cycle of birth and death forever. The liberated atman finally enters kingdom of god (Vaikuntha in Hinduism).