An older brother on Reddit under the username Fine_Refrigerator216 explains that he only wants to give his sister somewhere to stay because she really needs it, but he didn't expect to have to monitor dishes and give bill reminders every day. He agreed to take in his 22-year-old sister after problems with her roommate. They never set a date for her to leave, although she mentioned she was already looking for somewhere else to stay, so he didn't expect the agreement to last so long. At the beginning, she contributed to groceries, and they spent time together. Now, 7 months into the arrangement, she does not help with anything unless her brother asks her to. She leaves dishes around, uses his belongings without asking, and needs reminders to pay the bills.
Naturally, the older brother started building frustration after having to ask for basic consideration. Sharing someone else's home means paying attention to how your habits affect them. Helping with house chores and paying bills is also something you must consider because it's a place you are also using. The brother talked with her about it, and nothing changed. The sister continued making living in his house more and more unbearable, so he gave her one month to move out. Their parents even dared to call their son selfish, but they didn't offer the sister a place to stay in their house. The only one who helped the sister and waited for her for 7 months was the brother.