My Toddler Ghost Sim is Gone and I Don't Know Why My Game Still Crashes

[Rubyna]

I need some help,please....
I have one male sim that purposely being killed by fire to make baby ghosts, and after he has a baby, I aged the baby into toddler and I saved and changed the active household. But the weird thing is everytime I checked that family when I played the other families the toddler ghost wasn't there, and I thought maybe we can't see the ghost from other family, since ghosts aren't show up on relationship bar, except when the other sims interacted with them. So, I'm started to play that family again, and I couldn't find the toddler ghost anywhere, including his tombstone. But he's still exist on the family tree, and I'm wondering why is he don't aging? Is he go back to Netherworld?? But how and why? And strangely, his thumbnail's color on family tree is orange not gray like his resurrected father or like his brothers on the other household. I'd love to have him back, does anyone know how to do that?
Ah, and one more thing, his mother has her car on her relationship bar! When I clicked it, she could use it normally like when the car on her inventory/garage. I think it's not suppose to be there, and I don't know that a car could be in the relationship bar. It never happened before.

And the other problem is my game is still crashing randomly after few hours, and today it crashed faster than before, before I saved it..! 
I don't have any mods, just CCs, default replacement eyes and default replacement skin.... I already did DEP setting, and it still crashes. What am I supposed to do then?
Thanks in advance~! 

[Matthew]

Maybe you should not use CCs, because I think they are a bit dangerous.

One thing about the relationship with the car: This is just normal.  You will improve the relationship with it as yhou drive it more, and eventually you will become best friends with it.

Hope this help!

[Ricalynn]

I would work to see if you need to clean up any of your CC in case it's not compatible with any  new patches you may have recently installed.

Is it just this game that the game crashes?   Do you have reflections on for your mirrors? 

Make sure reflections are off.  Try a new game and see if it still crashes.  Possibly think about saving all your households and starting a fresh new neighborhood.  A factory reset isn't the end of the world and very easy compared to a complete reinstall if you think your game warrants it.    And make sure you delete the DCBackup folder, CASPartCache.package, compositorCache.package, simCompositorCache.package & scriptCache.package at least once in this whole process if you haven't done that in a while (before the factory reset).

Sometimes the game needs you to restart your computer as well if you haven't shut it down in a while.

[Rubyna]

But I don't have Fast Lane, just High End Loft, WA and LN, is that really a normal thing..?

Hmm... I guess you two are right, some of my CCs are out of date, I downloaded them before I installed LN, I'll try to clean up the old ones.
Since I'm playing LN the game crashes occasionally, and yes I have the reflections, why is it has something to do with the problem?
I haven't deleted the caches before, I'll do that now..! Thank you so much for the suggestions, I'll see if they work!