A split week works only when the first version is built in the right order. Most families start by dropping Mom's appointments onto a blank calendar and then squeezing the kids in around them. Flip it. The kids' row goes down first, because school, activities, and rides are fixed points that do not move for anyone. Mom's row goes on top of a full calendar, which makes every collision visible on the day it happens.
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Step one: build the kids' row
Enter the school days, the pickup and drop-off times, the standing activities, and the rides that are already set. Use one color for the kids' row and keep it steady. Do not add anything from Mom's side yet. The point of this step is to see the week the kids will live in, without interruption.
Step two: lay Mom's row on top
Now add the fixed items from Mom's side: standing appointments, errands, visit days, and any helper hours. Use a second color. Where a Mom item lands on a kids' item, mark the overlap in lemon, the color you reserve for collisions. Every lemon block is a decision you have not made yet, not a failure.
Step three: give each collision an owner
For each lemon block, write one name next to it: you, your partner, a helper, a neighbor, or the activity itself. If nobody can own it, move the Mom item to another day or ask whether it can wait. Keep the note short, such as who covers the pickup and who does the afternoon visit. The handoff belongs in writing where the other person will see it, not stored in your head.
Step four: run one full cycle
Do not judge the setup after a single day. Run the whole week, then one more, and note what breaks. Common breaks are a car leg with no buffer, a helper who arrives after the pickup window closes, or a handoff nobody confirmed. Fix only what broke and leave the rest alone. Adjust the calendar, not your patience.
Step five: keep the weekly review short
Once a week, look at the lemon blocks and ask two questions: which ones repeated, and which ones handled themselves. Repeated lemons need a permanent owner. Handled ones can stay as they are. If a block keeps needing rescue, the Mom item probably belongs on a different day, which is a scheduling fix, not proof that you are doing it wrong.
The full structure behind this method is laid out on the The Kids' Week and Mom's Week page if you want to see the whole thing before you start.