Dh's sister is coming over for New Year (to NZ from UK). She will stay with PIL for first week, then we are taking her away to a 3 bedroom holiday home - which we have booked for a week. She is staying a week and then meeting a friend and going on for another week somewhere else with friend.
We invited PIL to visit for "a weekend", saying we wanted some time with SIL on her own as well.
Then they start talking about coming for a week - and I patiently (and bluntly) say "you are welcome (to come)for 3 nights".
We are staying for a fortnight and no way am I spending half of that with FIL and his favourite bible.