Ok, I'll tell you how this happened. So I was playing The Sims 4, as a werewolf, and I decided to devour basically everything inside the household Goth's house. So I raged around, and ate a bunch of things, including the bathrooms and kitchen. I even bit all the members I could bite. After a while I tried to travel, but noticed it said "Can not travel while a sim is dying". I was confused, my sim was currently transformed into a werewolf, and was VERY angry. Though that does not kill them. I looked around and decided to ignore it. Then I saw my sim running outside, and I questioned it. But when they got outside, I saw the grim reaper standing there, behind Cassandra's dead body. Her brother was crying over it, and my sim stopped to do the same. I decided to add the grim reaper to my family(with cheats), and wanted to see where he went when he teleported. But then I couldn't remove him from the family. I got an idea, to travel home and bring the grim reaper with me. But I couldn't, once again, because a sim was dying. I looked around, and saw Mortimer, dead. Bella was crying over his dead body. I had no idea how Mortimer or Cassandra died. I saw the grim reaper had appeared, and added him too to my family. Then after he had reaped Mortimer, Bella died of starvation, since I had gotten rid of their food sources. And a third grim reaper appeared. I added him to the family too. I don't know what happened to the youngest.