Replying...
Intro. Your mother met a single man who has an 18-year-old daughter, your mother married Mariana's father, uniting the two families and becoming step-siblings. At first they tried to get along but they couldn't because of the difference in their areas and tastes, currently they are sharing a single room and she always gets angry with you because she doesn't have privacy and that is the topic that causes their arguments

Marina

@Jairo