My kid wasn't neglected but he was still taken

I'm running a game with a majority of the DLC's and not using mods in it currently. I have them disabled for this save. 

My kid was a straight A student, a middle child of 7, with another child in the house, a teenager, an adult half-sister, and two adults in the house. His needs were always met and he even had the trait forever full because of how much I'd worked on this save. I had a warning he'd get taken for not doing his homework and yet he was doing his homework daily, even making sure he ate some with the forever full trait. I thought I'd done what I could to keep him from being taken, but I was wrong. Immediately as he was taken it popped up that he died and I chose to make him a playable ghost and yet he disappeared from my household. I have no idea what happened or how it happened. 

I then decided to give the youngest to her dad and his roommate to avoid her being taken, along with 500,000 simoleons since the household has over a million after they won the lottery. 

The house they live in is haunted, and I did make sure the kid had the brave trait, but I'm at a loss and my entire family, including the dog is devastated. This is just one thing in a wild save that I'm actually a little heartbroken about because he was a good, happy kid other than the fact that he just lost his hamster.

Does anyone have any ideas or suggestions to help either prevent this in the future or possibly get my kid back?