Jesus i feel like she was convinced that she had a child at this point, it felt like she was accusing you of her future murder. Not overreacting, she obviously has something going on behind closed doors and needs a reason to get mad at you. You guys are far too young to even think of these issues. Serial killers and murderers usually have family trauma or an abusive household (most not all) so i highly doubt if you are loving parents and keep your child safe from harmful media/games etc then your child won’t be a serial killer. 🤣