my sister in law has asked my DH if she and her partner can stay for two nights next week. our spare room houses one, it is very small as larger room has bunk bed for two girls. They want to stay so they can go to a city about an hour from here as she has properties there and needs to check / do some work on them. they are coming on school days Thursday and Friday and I work (albeit part time) on both those days. Not sure if they will stay to spend time with their nieces on Sat. his sister only rings us at home when she wants to stay. I feel rather put upon and feel that not for the first time we are being used as a hotel or doss house. :( We do stay with them but buy food,( as often no food for breakfast or the children) buy her flowers, help out in the kitchen, walk the dog. His sister is a heavy drinker (two bottles in an evening is not uncommon) and rarely surfaces before 8.30.... Any advice??