In the sims 2 how do you get rid of ghosts without deleting the tombstone?

In The Sims 2, you can get rid of ghosts without deleting their tombstones by using the "shrink" interaction on the gravestone with a Sim who has a high Logic skill. Alternatively, you can have a Sim with the "Knowledge" aspiration use the "Reanimation" interaction at the tombstone, which can sometimes lead to the ghost moving on. Another option is to have a Sim perform a séance with a "Spiritual" aspiration to help the ghost find peace.