Jai Sri Baba Lal Ji,
Heaven and hell exist within the self in different states of mind in life.
Mind, intellect and ego are subtle truths which are aspects of the soul itself.
Even after leaving the body, the truth of intellect and ego combined with the mind can disturb the soul in other realms.
This is why many rituals are performed to confirm the subtle truth of the departed souls. Tarpanas performed with a sincere heart can be very helpful in reaching the truth of ancestors and help them within a limit.
Jai Baba Lal Dayal Ji,