A day of clothes

So in the house that i lived in with my family we have certain days that we have to follow. My days are on saturday and Tuesday to do my laundry. My sister and her girlfriends day are on Wednesday and Monday. I followed these rules unless I have something that needs to be was that day. Do you think my sister and her girlfriend Followed those days? No. They were doing two days this weekend one of them was on my laundry days. Its like stay to your laundry days