When you get a tinge of diarrhoea you know what you’re in for: frequent trips back and forth to the toilet (often with little or no warning); skid-marks ahoy; the feeling of being drained, dehydrated and defeated, and the involuntary commitment to time spent nursing a thoroughly grotty botty. It’s okay, though. After a day or two of discomfort your poor, stinging bum-hole and over-worked digestive system will return to normal. You know this. You accept it.

But knowing this and accepting it doesn’t mean that diarrhoea suddenly becomes an enjoyable activity. ‘Ooh, a gurgle in my stomach. Is it a fart or is it a jet-stream of shit? I just can’t tell. I LOVE THIS, IT’S SO EXCITING!’

And so it is with our off-spring (Yes, Doctor Spock, I’ve just compared my children to a messy bout of shitting – what does your book say about that?)

When our children hit a developmental milestone and begin exhibiting a new set of challenging behaviours you know that before too long (it always feels too long, however long it takes) their brain will knit itself into a different pattern and their capacity for reason, empathy and self-awareness will alter, increase, and evolve, ultimately leaving you with happy, likeable kids who don’t make you want to leap out of an airplane using only a bottle of vodka as a parachute.

While you’re dealing with the worst that your kids have to throw at you, it pays to remember that those tiny beings who push our buttons so expertly aren’t wise agents with full control over their own minds and destinies, but frightened, foolish, fun-loving little proto-people, who spend their days rushing and rocketing between sensations, agonies and epiphanies, all the while as their fragile bodies morph and spin and sprout and change, seemingly at the speed of a Tasmanian devil that’s perpetually stuck on fast-forward.

Unfortunately – as with the squits – realising all of this doesn’t make the minutiae of their madness any easier to handle, no matter how many times you count to ten through gritted teeth, or chant ‘gentle parenting, gentle parenting’ to yourself as you crush a Pyrex jug to dust with your bare hands.

If you’ve got two kids of roughly similar age, then God help you (If you’ve got more than two, you absolute psycho, then I can’t help you. No-one can. You’re doomed… DOOOOOMED). Just as one child is coming out of a developmental cycle – new and improved, perhaps even temporarily tamed – the other one’s usually just about to enter one – at the new end, the bad end – their challenging behaviour rubbing off on the other one, the bigger one, who had looked for one precious, fleeting second as if they’d actually turned over a new leaf.

Nope.

And round they both go, around and around, again and again, shitting their destruction over your soul like a pair of possessed muck-spreaders.

It’s incredibly difficult to negotiate with these tiny terrorists. They want different things from you, and from each other. By way of example, our boys are 4 and 2. Their communications arrays are at very different stages of construction. Our eldest can pick up and decode most of the transmissions we send to him, but there are some that transmit on too low a frequency for him to catch. And, distressingly, a high proportion of the signals that do manage to get through to him are drowned out by a rogue signal being beamed from within his own brain, which appears to be amplified by tiny and invisible but none-the-less immensely powerful loud-speakers dotted around his skull. This is the message:

‘AAAAAAAAAAAAAAARRRRRRRRRRGGGHHHHH!’

Our youngest picks up very little of the instructions we transmit to him. If he obeys, it’s mostly just luck. Next to negotiating with a two-year-old, herding cats is easy. Trying to reason with small children is more like herding hungry sharks.

The signals the two kids broadcast to each other are always scrambled. They spend most of their time scrutinising each other like drunk submarine commanders from rival warring countries, bunkered down under the sea and cut off from their respective governments, both with their fingers poised over the Nuclear Destruct button, unsure whether the other one has already pressed theirs.

Looking after two is tough. Hell, looking after one is tough. The bad news is, you can’t always seek strength in numbers. Sometimes you can be outnumbered by your off-spring even if there’s a balanced ratio between adult and child. The chaotic unpredictability of a child enhances its destructive power far out of proportion to its size. For some kids, you might need as many as twelve adults to keep them in check, and quite possibly a Hannibal Lecter-style prison-trolley and muzzle.

Last autumn, my partner and I took our two boisterous boys to the Museum of Scotland, in Edinburgh; by the end of the excursion their mother bore a striking physical resemblance to many of the angry jungle cats whose mouths were frozen in fury along the walls. The kids fought, they fled, they fought some more; they bashed, they bickered, and bounced; they hurled food on the floor, and hurled themselves at strangers, nearly knocking over a multitude of exhibits in the process. They shrieked and yelled and leaked and raged, fighting to the death for a spot on my high shoulders.

Having to shout the same clutch of stock phrases over and over tends to take the fizz out of a day of fun and cultural enrichment. Towards the end of the day I genuinely shouted the following at my four-year-old son: ‘You walk one more step away from me and I swear you can kiss the car we’re saving up to get you when you’re 17 goodbye!’ Now that’s some next-level consequencing.

I’ve been driving my partner to the gym two nights a week, and, brave fool that I am, spending the hour between drop-off and pick-up entertaining the kids in town: one evening taking them to the pet shop (or ‘The Free Zoo’, as I like to call it), the next evening to McDonalds, another evening to the furniture shop (or the Free Funfair, as I like to call it), where we can bounce on the display beds and ride up and down on the escalators.

Sometimes necessity dictates that we go shopping, a prospect I rarely relish in tandem with my partner, never mind alone. If you’re a lone parent taking multiple children with you to the supermarket to do the shopping, you’re either a little bit crazy or really, really, really fucking crazy.

There’s a double-decker shopping trolley in the big Tesco in town that’s trolley on top, plastic toy-car on bottom. Naturally, my kids fight over who gets to sit behind the wheel of the car. Yet again, the myriad faults in our shared communication matrix make negotiation almost impossible. Even when the intellectual conditions are ripe for striking a deal with my eldest – “If you sacrifice this for your brother, I promise I’ll reward you with x,”; “Remember, he doesn’t understand things as well as you do, and gets a lot more upset at things, so we have to help him a lot more,” – if his sleep/mood/sugar balance is off by even twenty minutes or a lolly-pop then, shit, I might as well try to mediate the Israel-Palestine conflict dressed as a naked Hindu God, covered in makeshift Hitler and Allah tattoos.

During a particularly memorable trip a few weeks ago I almost voluntarily committed myself to (not a mental institution, but) the sea. The mighty ocean. The younger kid screamed for the car at the base of the trolley. The eldest kid screamed because he wanted the car. I figured the screams of the eldest would be easier to bear, so gave the youngest kid the car. The eldest kid wouldn’t stop screaming, so I wheeled the trolley back to where it came from, and ordered them both out. Then I had two screaming kids. But at least their misery had been equalised, even if it was at the cost of doubling mine.

The screaming died down. Eventually. But the screams weren’t gone, merely dormant, lurking just beneath the surface of reality waiting for the smallest of ‘nos’ or ‘stop its’ to invite them back into the world. The youngest wanted to run rampant round the store. Very understandably, I didn’t want him to do that. He objected, in very strong terms, which he conveyed through an electrified flood of tears and tantrums. I had to jog through the shop holding him under my arm, a horizontal lump wriggling and shouting to get free as my eldest kid jogged by our side. We must have looked like a fractured squad of injured soldiers running through a battlefield to the evac point.

Upon reaching the check-out and loading the conveyor, my eldest announced he was desperate for the toilet. I angrily threw the groceries back into the basket, and rushed us off to the bathroom, whereupon my youngest splashed and patted his hands in a dirty urinal as I was holding his brother up to pee in the urinal next to it.

That was a dark day.

But the next week, something magical happened in that supermarket: nothing. Absolutely nothing. Nothing stressful, in any case. The kids were little miracles of civility: polite, responsive, calm, cute and courteous. My youngest took the car, but the eldest didn’t mind. He rode in the trolley above, helping to pack the groceries, and proving an able navigator. I wanted to show them off to the world. Behold! Look what models of citizenhood shot from my loins! High-five me, peasants, for I am surely the greatest Dad in the world.

Bouyed by this experience, the next week, apropos of nothing, I decided to take them both out for dinner at a restaurant that DIDN’T have a soft-play. Such arrogance deserved to be punished. But it wasn’t. They were a dream. At one point they even sat on the same chair peacefully feeding each other. I couldn’t quite believe it myself.

So does that mean that the cycles are complete? That the worst is over, and they’re now running in concert with each other, working together as a beautiful, harmonious unit?

I got this text from my partner during the week:

“You’d think that the extra half hour in bed would make them better people! Normally Chris just putters about doing his own thing and is generally pleasant but even he was a bit of a dick today. He kept throwing his hat into people’s gardens. I visualised throwing him over the wall after it.”

And I’m writing this post you’re reading now while sitting in my local coffee shop, half-frazzled and surely suffering from mild PTSD after shouting ‘Don’t hit your brother, don’t hit your brother’ at least 60,000 times this morning alone. I’m on my second large coffee of the day. It won’t be the last.

The cycle never ends, my friends. It just mutates.

Different shit, different day.

Just keep dashing, wiping and washing. That’s all you can do.

But don’t forget – if you’ll allow me to refer back to the diarrhoea analogy with which we began – to enjoy the moments between the gurgles and the rumbles and the worried checking of your pants.

Those moments make all the shit worthwhile.