Lots of issues. Without reading your parenting plan my answers are general, and could change depending on the exact language. As far as your Easter trip, in most cases you could simply have made the kids available at the time and place found in your plan. If a responsible adult known to the kids (your parents/family) took kids to the exchange that should have been fine.
Whether you can relocate or change kids' school will be more complicated. That's a big old maybe and will really depend on the where, why, how, etc.
Answered on Mar 23rd, 2020 at 8:27 AM