My friend took in her 35 year old nephew after he was kicked out of the United States (3 strikes rule and he was born in the UK). My friend who is of ill health didn't ask her nephew for any money even when he started working, and he too works all hours and bringing home designer labels, takeaway food (he leaves the half eaten food in his bedroom, dirty cups, clothes on the floor). When my friend asked him to start paying rent she asked for £200 per month her nephew thought she was being unreasonable and said it was too much.money. He eventually paid her something but it wasn't regularly but the clothes buying and takeaways continued. It was only when he met his girlfriend that he moved out at over 40 years old. I don't think this gives much advice to the initial question but I wanted to tell you what my I'll friend went through.