Start now, each of you thinking about what you would each like to do.
With three, it's most likely possible to accommodate everyone's wishes. When there are more of you, it becomes necessary to 'join in' and go along with whatever is planned.
We see family in the days running up to Christmas Eve, so are often just the two of us for actual Christmas.
When it's just DH and I, we tend to go out on Christmas Eve, often dancing and get home quite late or even early on Christmas Day.
Sleep late but not too late as DH looks forward to presents first thing (adult first thing, 9:30 - 10ish, not 6am
I'm not a big drinker but Christmas Day we open a bottle of vintage champagne (DH has a cup of tea to go with it). Open presents from family and friends then each other, DH loves surprises and is not difficult to please present wise, so no drama picking things which are beautifully wrapped.
By 12:30 we are washed and dressed for traditional Christmas Dinner at lunch time in a local (walking distance) restaurant. We stumble out around 5-6pm and may walk the 'long way' round the village green.
Home and the delights of the television and drift into the sunset perhaps with a morsel of cheese.
On Boxing Day DH recovers while I go out for a good long walk to brow away the cobwebs.
My favourite adult Christmas.