Holidays are where the two calendars stop being a scheduling problem and start being a family problem. You are not only deciding where the kids sleep. You are deciding who drives, who cooks, who sits at which table, and whose feelings get a turn at the dinner. Before you say yes to any version of the split, check these things first.
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Time the drive, both ways
Drive the route at the hour you would actually leave, not at the hour the map suggests. Note how long the kids can sit in a car before they start to fall apart, and plan one stop if the number is close. A split that works on a quiet morning can fall apart in holiday traffic, and the afternoon you lose on the road is an afternoon you do not get back.
Agree on the handoff
Pick the time and the place. The driveway, the school parking lot, and the grocery store lot are all different kinds of stressful. Say out loud who is driving, who waits, and what happens if one party is ten minutes late. A handoff that is never discussed becomes the argument you have in front of the kids.
Divide the parts, not just the days
Splitting the days is the easy part. Ask who makes the meal, who buys the gifts for the kids, who handles the call to the other side of the family, and who packs the bag. Write the list in one shared note, so that it is not a secret set of expectations living in three people's heads.
Ask what happens when plans change
Somebody gets sick, a car breaks down, the weather turns, or a parent needs help that was not on the calendar. Decide now what gives way. A written rule, even a one-line rule, saves you from doing that negotiation at the door. If a written agreement already covers holidays, start there and check that it still matches how your family actually works.
Be honest about who is carrying the planning
If you are the one holding the calendar, the phone, and the car keys, say so. Your partner may not know how much of the holiday runs through you until you name it. Naming it is not a complaint. It is how you get a fair split of the work, not just the days.
For the bigger picture of how to share the week, see The Kids' Week and Mom's Week.