80s Horror brother and sister
Argh!! Reading these posts are only making me think of other movies that I can't remember the names of!
God, I hope this was a movie and not a dream, lol: an older sister (blonde, ponytail, "preppie") and younger, nerdier brother are home alone. The brother maybe had a friend over and they are obsessing over watching movies and eating candy. The climax scene is in the kitchen, with either the sister's boyfriend accidentally getting killed, by her, or he's the killer all along and she kills him defending herself and her brother?
Anybody? Lol, I probably just described about fifteen different 80s soft horror movies.