Reading a thread concerning sleeping arrangements for Christmas has reminded me of a situation a few years ago and I wondered how people here would have arranged it.
1 parent, 2dd (one 20, other 10). Four-bed house but with a sofa-bed (comfortable) in the spare room. Oldest dd has a uni friend who will be doing work experience in the city so invites her to stay for the summer. Friend will be paying for lodgings.
Since putting the lodger on the sofa-bed is out of the question, which dd would you move to the spare room? Elder dd as it's her friend causing the move, or the younger as she gets her room for the rest of the year?
YABU - elder should move
YANBU - younger should move