I just saved one sim from Grim after she collapsed from freezing. She was on the street in front of my sim's house and my sim convinced her to group up. It would take too long to walk back to my sim...
Nothing changed in my game. I turned on weather effects just to see if it keeps happening. Here it is, his mother froze to death yesterday, now his turn. He is the brother of my currently played sim who also died yesterday ( from laughter), but she was spared after pleading. Even their ghost dog came to check what is happening. https://i.imgur.com/EoVAYs3.png