It is absolutely imperative that you do NOT mess with Grim or any of the other NPC's who's character files are located in the objects.package file, as they are integral to the game and how you play it. For instance, Santa Klaus (that's how the game spells it. lol) is a universal NPC, just as Grim Reaper is, so there's only one Santa and the game will summon him when needed. When you add any of them to a household the game is bound to mess up. As for the Tricou family: Judging by what you've described, it isn't the Tricous who caused it. It sounds like either some conflicting CC or your neighborhood (or install) is messed up. I had a similar issue with vacation destinations and the phones: My Sims would pick up the phone and then put it back down. Even after removing all of my CC (I moved the Downloads folder to my desktop) the issue still occurred. I didn't ever do any game-corrupting actions to do this. It was a fresh install of the Ultimate Collection from EA's Origin service.
On a side note: Don't resurrect any of the Specter ghosts if you ever thought of it. They are very messed up ( a few of them even have the wrong gender and age flags! Melissa Sims, a teenage girl, is recognized as an adult male and she has no aspiration or personality points, from what I recall). If you get annoyed by them, just move their graves to a cemetery (I add the largest empty lot template to the very edge of the Strangetown map so it's pretty much out of sight.