My ds was due on Xmas Eve, but put in an appearance on Xmas Day! My dd, (then aged 5)
came in our bedroom with her very full stocking about 6 am, she'd opened about 3 presents when I felt my waters break!!
The morning was a bit mad after that, I didn't say anything at all as I wanted my dd to enjoy opening her stocking with us watching. Once she'd finished I told dh, he quickly showered, called my parents who came + collected dd + we made our way to the hospital, (luckily I'd packed the labour bag already!)
We had a fridge full of food, as the plan was that if baby hadn't arrived, the whole family were descending on us Xmas afternoon for a buffet + present exchanging! Anyway, my ds wasn't born until late Xmas evening, with contractions stop/start most of day.
We came home the next day. Our dd had a proper Xmas day at her grandparents with lots of presents (+ the v. exciting phone call that her baby brother had arrived!), the day after we were home from hospital everybody came to us + she had all of our presents, then dh's parents arrived New Years Eve, (they live a distance away), + she had the equivalent of another Xmas Day!
Needless to say, when she recently asked me, (she's 10 now), if she missed an Xmas when her baby brother was born I was a bit peeved that she had no memory of it all!!
She does remember coming to the hospital to see us though!
My advice to the original poster would be to organise as much as possible early. I can't believe that just after my waters broke I was frantically writing present tags! I'd wrapped everything but was hoping to add the new baby's name to ours in the "Love from" bit if he arrived before the big day!!