I wish we had done that with DD. I ended up having my whole family waiting outside the delivery room, and then came in 5 minutes after she was born, I wasn't too happy about that. Hopefully this time, which Mum being stuck minding her, and with the rest of the family living at least 1.5 hours away, they will wait until we have reached the maternity ward before they come.
Anyway, they bloody show all day, sounds promising, but I'm sure it did the first time too, but you did only had it once and not all day right? Maybe this time it does mean something, but who knows right!!!