We are going away soon to attend a wedding. Me, dh and our ds age 8. We are staying for a week as the wedding is quite far but in a great location so we decided to turn it into a holiday.
My sister and bil, and my sister's friend (I'll call her Judy) and Judy's dh and child, are also attending the wedding and will be staying in the same accommodation. It's a large B&B house with individual rooms/apartments.
I don't know Judy other than to say hello (this is relevant).
Dh and I booked our accommodation first, it's a one bed apartment with kitchen and sofa bed in the lounge for our son. We told my sister about it and she and her dh booked another of the apartments and decided to also make a few days of it too, fine.
Sister told Judy about the B&B and Judy then booked up the last room. Judy's room is only a double room rather than an apartment. My sister has told Judy that her dd can bunk in with us for the week and share the sofa bed with our ds. Also that Just can share our kitchen.
The dd is 12 or 13 afaik. We don't know Judy or the dd. I've spoken to Judy in passing but I've never even met the child.
I've said no but my sister is saying I'm being selfish as Judy hasn't got room and the dd will have to sleep on an airbed.