The Other Half

Renee takes care of her younger sister Grace since their parents aren't around anymore. Their parents were well-known around town, as Grace and Renee's mother was known for "being crazy". Back in these days, there was no diagnosis for her symptoms, but everybody knew her personality could shift like a switch; good or bad immediately. The girls' father was drowning in the responsibility of taking care of his wife, as her condition only got worse with age. He ended up drinking himself to death, and the mother was sent to a mental institution to be taken care of.
The girls were alone with no one to take care of them except each other. Renee ended up taking all of the responsibility because Grace was just a little girl at the time. However, Renee began feeling like her father; stressed all the time and a little out of it. Grace grew increasingly worried about Renee's health and told Renee she needs to talk to someone. Renee, immediately thinking her sister was trying to send her where their mother was, revolted. She had a complete mental breakdown. Although Renee has recovered now, the girls haven't talked since the incident.
One night, however, Renee has a strangely vivid nightmare. Waking up in cold sweats, she realizes that the nightmare was about someone murdering Grace.