As long as you are willing to help your kids catch up on any work they miss, you should be fine. I teach 2nd grade, and I try to be understanding when families travel during the school year. I myself have taken my daughter out for a week in Kindergarten to do WDW and 1st grade this past January to do a Carnival Bahamas cruise.
The one thing that is truly frustrating to EVERY teacher in my building is when parents request work ahead of time and then don't do it. If you aren't going to do the work before you go/while on vacation, don't ask for it in advance. It is a pain in the rear to gather everything up for the student, and then they come back and have NONE of it done. We get, "Oh, yeah, we just started working on that last night."
Great, thanks. So glad I spent all of my planning time for two days trying to finish up lesson plans and copies so that you had all of your work ahead of time. (Sorry if that sounds snarky, but hopefully you can kinda see my frustration here!)
Also, if your child is already behind academically, DO NOT pull them out during the school year. I have a little girl in my class this year who was pulled out THE FIRST TWO WEEKS OF SCHOOL to do a
Disney cruise/WDW trip. She was reading a year and a half below grade level. (So, since I teach 2nd grade, she was reading where an average Kindergartener would be in the middle of the year.)
She came back and was completely lost. She had missed the first two weeks of school, so she didn't know any of the routines of the room, etc. On top of that, she was behind academically and struggled. She has been struggling all year to catch up. (Obviously not ALL of that is due to her vacation, but it certainly didn't help.)
When the kids get older, the teachers are responsible for teaching all of the standards for state testing. (DON'T pull your kids out during required testing!!!) Unfortunately, the students are still responsible for that curriculum, even when they aren't there. Again, that's why it is so important to do the missed work and not just pitch it.
At 2nd grade, I typically excuse the kids from most of the work they missed. I occasionally grade a few items. But our upper grades grade it ALL. So if the kids don't turn it in, it's a 0%. (Because a vacation is not an excused absence.)
As long as you are upfront with the teacher and willing to do the work that your kids missed, you should be fine!
Wendy