Long time lurker, first time poster. This story happened 2 years back when I was interning in Boston during college. I have two younger step sisters who were in high school at that time. I am three years elder to my elder step sister. So, when she was starting senior year I was starting my junior year in college. This happened during the summer before the junior year.
Although my dad’s family lived in Boston, I hardly visited them during my internship. I was staying with a bunch of college friends who were also interning. As a result I only went to visit him mostly during weekends or at random times. I still had the keys to the house and my own room though. I didn’t have much association with my step sisters as we didn’t grow up together. I am not a jerk and thankfully they aren’t either. So, even though we weren’t close like siblings, we weren’t in any bad terms.