I have a villa booking with my brother next month in Spain, which has four bedrooms and 8 beds. There are 7 of us going including kids. My sister has just booked a last minute flight to come join us for a couple of days, I said she could stay in the spare bed, no problem.
The only issue is, I just noticed a stipulation on our villa booking that in no circumstances should anyone not on the original booking come to the villa. I assumed this was to prevent house parties etc, which is fair enough, but I am confused if there is a legal implication to letting my sister stay in the spare bed a couple of nights.
Should I just do it and not say anything, or do I need to call and ask permission from the villa? My main concern is potential extra cost, or if they say no to me then she has nowhere to stay and the perfectly good bed is unused.