I know this should probably be in parenting but aibu gets more traffic. DSC has asked to live with us whilst doing their final year at uni, when little they lived with their mum but has gone to a uni fairly near us and next year it just works to live here. Obviously we have said yes, and DDs are really excited to have their big sibling here for a longer time, that might wear thin when they have to share the bathroom.
Anyway my aibu is, should we charge rent? Which I sort of think we should as a principle but how much is fair? They had to pay rent for shared houses/hall of residence in the other years. Do we just ask for a contribution to the food bill which will massively increase with another fully grown adult in the house. I don't think it will impact our energy bills having one extra person, the heat and light is the same (and I think all of us will be on timed showers come the winter to try and keep costs down)
If they were working and earning it's a straight yes, you pay rent, but adults who are studying I am not sure what is fair.
What have others done in this situation? Thanks