Woah. That happened to my sim too! Well sort of like that. He was enrolled in that 'Peace and Love' boarding school. And then a memory popped up and said "Yumi is in mourning because Sam Sekemoto died' and then, another message popped up, "All Sam's belongings have been moved to Yumi's inventory."
And the worst part was when Sam started haunting the house. But then on Sam's birthday, a normal teenager Sam came walking through the door.
That was the spookiest glitch I have ever had.