Your post is missing some information but I gather you are complaining because someone's father is asking them to pay rent while they live there. My question is, why shouldn't she pay rent? She seems to have an income of some kind so she has some money. Our parents are responsible for us until we reach the age of maturity which seems to be 18. They are not bound to provide lodging, food and support after that time. Don't forget, it costs money to have an extra person or two living in a house. They use more water, soap and paper products. They eat the food. They watch the TV and use the lights which cost electriccity. None of these things are free to the parents. If she is an adult your fiancee should start paying her own way.