No one can tell you a definitive answer on this one as each case is different. This is why I recommend putting in a holiday schedule into the order, often exs don't agree on what this means. If you can't agree, go to mediation and see if you can come to an agreement with their help.
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Find an attorney that will grant you a free consultation and show the document to them. I would expect that we are talking about the same holiday on alternative years.