The rules each house keeps

The first time my eldest came home and said, "But Mum lets us have ice cream after dinner," I felt the trap close around my ankle. There it was. The first ranging shot in what I'd been told would be a long campaign of comparison. I spent about ten seconds composing a speech. Then I remembered I didn't have to give one.

The single most freeing realisation of co-parenting, for me, was that the two houses don't have to align on most of the rules. In fact, trying to align them is usually worse than letting them differ. Kids are wildly more adaptable than the parenting books credit. What they cannot adapt to is two anxious parents, each trying to prove the other one wrong.

Why two rule sets is fine

Kids run different operating systems at school, at Grandma's, at their best mate's house, at footy training, and at home. They always have. Mrs Henderson at school doesn't let anyone speak with food in their mouth; Grandma actively encourages it because she finds it hilarious. The kid figures it out. By age five they have a working model of "rules at this place" that they update on arrival.

Your house and your ex's house are just two more entries on that list. A bit weightier, a bit more emotionally loaded, but structurally the same. Bedtime can be 8pm at one house and 8.30pm at the other. Screen time can be limited at one and looser at the other. Dinners can be sit-down family affairs here and on-the-couch-with-the-iPad there. The kid will arrive, figure out the local rules, run them for the duration, and reset on the next handover.

What kids cannot handle, and this is the trap, is two parents who treat the rule difference as a moral fight. If the bedtime difference becomes a theatre for the bigger conflict between you, the kid is no longer adjusting to two bedtimes. They're navigating loyalty between two parents, with a clock as the proxy. That's an entirely different and much heavier load.

What's worth aligning, and what isn't

There's a small list of things where alignment is genuinely necessary, and a much longer list of things where it isn't. Knowing which is which saves you a lot of pointless conflict.

Worth aligning, no compromise:

• Safety: helmets on bikes, seatbelts always, no leaving the eight-year-old home alone, no swimming unsupervised. These aren't household preferences. These are floor-level non-negotiables.
• Medication: the asthma inhaler dosage, the ADHD timing, the antibiotics course. If a doctor has prescribed it, both houses execute it the same way, recorded somewhere both parents can see.
• School: the homework expectation, the device-at-school rules, the attendance policy. If one house treats school as optional, the other house's effort is undermined and the kid loses out.
• Big behaviour stuff: hitting, lying, stealing. Both houses agree these are not okay and deal with them when they happen, even if the specific consequences differ.
• Anything legal or court-ordered: a parenting plan provision, a court direction, a working-with-children kind of constraint. Don't freelance.

Not worth aligning, even if it bugs you:

• Bedtime by half an hour either way.
• Screen time approach, within reason. (If one house is six hours of unsupervised TikTok, that's a different conversation, but a one-versus-two-hour difference is not.)
• Food rules, including dessert frequency, vegetable insistence, and Vegemite versus peanut butter ideology.
• Clothing standards. If the kid wants to wear pyjamas to the supermarket at Mum's and you don't allow it, that's just a different house.
• Tidiness, chore expectations, and how you load a dishwasher.
• Pocket money, allowance, the chore-money relationship.
• The morning routine. Mum may run a tight ship; you may run a slow boat. Both work.
• Manners style: please-and-thank-you maximalism vs. casual register.

You will notice that the second list is much longer. That's the point. Most of what we argue about as parents is local style, not safety.

The "what happens at Mum's stays at Mum's" answer

So the kid comes home and reports. "Mum lets us have ice cream after dinner." "Mum says I don't have to wear a jumper." "Mum lets the iPad stay on at the table." The temptation, every time, is to litigate.

Don't.

The line I've used, more times than I can count: "What happens at Mum's stays at Mum's. At my house, we [insert the rule]. That's how it works."

Said calmly. Said without judgement. Said in a tone that suggests the topic is not interesting to you. Because it shouldn't be. The kid is doing what kids do, which is testing for arbitrage between the two regimes. The moment you engage with the comparison, the arbitrage opens. The moment you decline, it closes.

A few variations, depending on the situation:

• "Different houses have different rules. At mine, we eat the broccoli."
• "I don't make the rules at Mum's house. I make them here. Here, the iPad goes off at dinner."
• "That sounds great for over there. Over here, jumpers when it's cold."
• "Mum's call is Mum's call. Mine is mine. Both can be right."

The thing you are NOT doing, ever, is criticising the other house's rule. You are not saying "Well that's irresponsible of your mother." You are not raising your eyebrows in a way that conveys "Well, isn't that interesting." You are not even sighing. You are simply, reliably, redirecting to your house's rule and moving on with the evening.

The reason isn't politeness. It's that any criticism of Mum's rule is, in the kid's ear, a criticism of Mum. And in their ear, Mum is half of them. So you've just told them half of them is wrong. You don't want that, no matter how strongly you feel about the iPad at dinner.

When the kid is genuinely confused or distressed

Sometimes the report-back isn't strategic. Sometimes the kid is genuinely struggling with the difference. They feel pulled in two directions, they don't know which set of rules is "real," they feel guilty about preferring one regime over the other, they're getting in trouble at one place for something the other place permits.

That's a different conversation, and it deserves a different response. Listen first. Long pauses, again. Don't fill them. Let them say the second sentence. Usually the second sentence is the real one: not "the rules are different," but "I get confused" or "I don't want to make Mum sad" or "I forget which one is which when I'm tired."

Then you reassure, in concrete terms. The two houses are different and that's okay. Both houses love them. Their job isn't to make the houses match; it's to be a kid in each one. If they get a thing wrong (forgot to take their plate to the sink because at Mum's they don't), no one's going to be cross. The transition is the hard part; nobody expects them to land it perfectly.

What you do not say, even here, is "Mum's rules are confusing because they don't make sense." You also don't say "Mum and I should have agreed on this and we didn't, sorry." Both of those put the load back on the kid in different ways.

The small list, posted somewhere

I keep a small list, just for me, of the rules I actually care about at my house. It lives inside the cupboard door. About a dozen lines. Bedtime by school night and weekend. Screens off at meals. Boots off at the door. Homework before couch on weekdays. Help with the dishes once a day. Speak to each other like we like each other. That kind of thing.

The list helps because when I'm tired, on a Thursday, and a kid is testing some rule for the fourth time, I can glance at the list and remember which hill is mine to die on and which one isn't. It also helps because if a kid reports back with a Mum's-house comparison, I already know my own answer.

You don't need anyone else's approval of the list. It's not a constitution. It's just the operating manual for your branch office. Mum has hers. You have yours. Both can run.

HOLD YOUR LINE without making it a holy war. The kids will arrive at your door, drop their bags, and within twenty minutes they'll have re-entered your operating system. That's not a sign that the rules don't matter. It's a sign that kids are good at this and you can be too.

Different houses, different rules, same kid.