Hahahaha!
That's it really - I'm expecting my first baby in three weeks on the same weekend DSD is due to come to our house. Would you pre-warn DSD's mum or just leave it and see what happens - afterall, bambino could be early/late?!
Just for info - messing with the access rota is frowned upon by Ex, so would rather opt for the path of least resistance and not rock the boat unnecessarily!