A member of DP's extended family is coming to our city next week, I got a mail from MIL asking if she could stay with us 'for two to three weeks', that she was a very good guest, out all day etc. I was a bit about 3 weeks but this part of DP's family is estranged so I thought it would be nice to build bridges and wrote to her and said as we had a baby 3 weeks was a bit much but we could offer her a week, particularly as we might be going away for a weekend around then and in an uberbritish, overly polite and probably foggy manner implied we were amenable to guests that babysat pitched in and didn't mind a bit of disarray. Well, now she's written back to say she 'understands' we can 'only' offer her a week and in return 'offers' to housesit, with her work colleague, while we're away.
I was not too sure about having her around, have never met her and now she's inviting people of undisclosed connection to her to stay as well?