I'll have an interesting dilemma in a few years time - my son is Irish/Spanish and they don't do presents on Xmas Day there - they wait for the Three-kings on the 6th Jan. Santa exists alright, but he's called St. Nicholas, doesn't wear red and has no sack - god forbid he'd come down a chimney.
The three kings look like Ali-baba, ride camels and magically pass by each house in the early hours of 6th when the gifts appear. worryingly, there is also a mini-christmas in mid-December when a substantial enough Xmas present appears for the child - a direct present from the parents.
Problem lies in the fact that we want to do time about for Xmas - one year here the other there.
The poor child could be very confused cos he has one set of cousins who'll be banging on about Santa, and the other lot who'll be waiting till the new year before they get their lot - calmed by substantial parental gift beforehand. He might also get smart, decide they all exist and end up with three sets of Xmas presents... I'm feeling financially challenged already.
Any hints from those with experience on bridging the cultural divide?