I've been playing Sims 2 alot few last months. About few weeks ago I downloaded 'Resurrection Potion' from ModTheSims. If there's a graveyard of some sim but you can't resurrect him/her with Resurrect-O-Nomitron, you can place several resurrection potions there and wait until the ghost comes. The ghost should drink one of potions and be resurrected after some time.
After I downloaded it, I of course went to resurrect everybody in Olive's graveyard. Now Ophelia can live with his parents and Lyla Grunt can move back to Grunt house :)