I dated a girl a few years ago with a completely psycho sister (ex was also crazy but did not hold a candle to her older sis) who lived at home with her parents with her 3 year old kid. She did not pay rent, did not pay bills and did not pay for food/clothing/etc. She did not really work all that much and for whatever reason her parents didn't claim her and her daughter as a dependent. Each year she would get this giant refund and take her toddler to Hawaii, telling everyone how much she deserved a vacation from her super stressful life instead of paying her parents for being a burden or saving to get her own place or anything. It absolutely baffles me how flawed the system is and how much of a leech some people are.