If all of your responsibilities for the semester have concluded (all region, S&E prep, Christmas concert, etc), does it matter?
I'm missing two and a half days next week because I'm taking my family on vacation. This will be the first time in the almost 10 years I've been teaching that I will miss work for family time. Earlier in my career I would have balked at taking a personal day for this. Now, since I've realized that family does come first, I am actually looking forward to spending time away from the office and with just the two of them. My co-workers will be picking up a little slack, but not so much that it's going to be a huge loss for me to be done the two and a half days prior to Christmas break. S&E work will abound.
I know it may be frustrating to have to pick up their slack, but they're doing what they have to do. It's only a short time, you'll be okay.