Ok so I asked ChatGPT to make you a fair schedule. It's pretty complicated but this is what is suggested;
Got you. Let’s rebuild this properly so it’s genuinely 50/50 and still gives him his 7-night block.
First, I’m going to correct the rota maths, then I’ll show you a clean equal split.
1️⃣ His actual pattern (30-day cycle)
From what you wrote:
Four on, four off, four on, four off, four on, ten off
That’s:
- ON: 4 + 4 + 4 = 12 days/nights
- OFF: 4 + 4 + 10 = 18 days/nights
- Total: 30 days
So, in each 30-day cycle there are 12 ON nights and 18 OFF nights.
2️⃣ Target for a true 50/50 split
Over 30 days:
- Total nights = 30
- Equal split = 15 nights each
We also want:
- Dad to have the boys when he’s OFF as much as possible
- Dad to still have his 7-night run in the 10-day OFF block
- Each parent to get 2 weekends per month (we’ll deal with weekends in a second)
3️⃣ Simple, workable 50/50 pattern (per 30-day rota)
Let’s label the days in one rota cycle:
- Days 1–4: ON
- Days 5–8: OFF
- Days 9–12: ON
- Days 13–16: OFF
- Days 17–20: ON
- Days 21–30: OFF (10-day block)
Now we allocate.
Mother
- Has the boys on all ON nights (Dad working):
- Days 1–4, 9–12, 17–20 → 12 nights
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- Plus 3 nights from the long OFF block:
- e.g. Days 28–30
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Mother total = 12 + 3 = 15 nights
Father
- Has the boys on the shorter OFF blocks:
- Days 5–8 → 4 nights
- Days 13–16 → 4 nights
-
- Plus 7 consecutive nights of the long OFF block:
- Days 21–27
-
Father total = 4 + 4 + 7 = 15 nights
✅ Result: 100% clean 50/50 over each 30-day rota.
- Father: 15 nights per cycle
- Mother: 15 nights per cycle
Dad still gets a 7-night stretch in his 10-off period, and the kids are with Mum whenever he’s actually on shift.
4️⃣ What about “2 weekends each per month”?
Because the work pattern is fixed but the calendar months move, weekends will “slide” through that 30-day cycle.
So you do this as an overlay rule:
- Count weekends in each calendar month (Friday and Saturday overnights).
- Work out, using the base pattern above, who the children would be with.
- Adjust handover by 1 day where needed so that in that month:
- Dad has 2 full weekends (Fri & Sat nights)
- Mum has 2 full weekends (Fri & Sat nights)
-
For example:
- If a weekend falls inside Dad’s OFF but he’s already had 2 weekends that month → that weekend becomes Mum’s, by handing over Thursday night or Friday after school.
- If Mum would only get 1 weekend that month under the raw pattern → you take one of Dad’s OFF weekends and shift the handover so it becomes her weekend.
These tweaks keep the overall 15/15 nights across the rota cycle, but avoid one parent hogging all the nice weekend time.
Bottom line
With this structure:
- Nights:
- Father = 15 nights per 30 days
- Mother = 15 nights per 30 days
-
- Weekends:
- Use the overlay rule to ensure each gets 2 weekends per calendar month, by nudging handover times when needed.
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