How do you stop ghosts haunting you on the sims?

Get rid of any tombstones or urns you may have. You can use a cheat to delete them, or you could have your Sims to move out of the house they currently live in. Leave the tombstones and urns on the lot. Don't place them in your inventory. When you move out and move back in the tombstones and urns should be gone and no more ghosts should haunt you. You could also try selling the tombstones and urns. Basically, as long as you have these items on your lot, ghosts will continue to haunt your Sims.