So, repeat after me, the mantra that all parents stick to... "never argue in front of the children". Hahahaha. Yeah, I know, impossible. A bit like asking children to use their "indoor voices" when they are trying to murder each other over a piece of Lego.
I have read conflicting reports about whether or not arguing in front of the children does them permanent damage (but then what doesn't these days?), or whether it makes them more resilient in future life. I'm hoping the second one is true. Although frankly I'm just grasping at straws here because, as you all know, I just make it up as I go along.
I did discover another reason not to argue in front of the children. Sooner or later they are going to realise that your arguments are not high-minded complicated stuff that only adults truly understand. Nor are they Important Things That Parents Must Get Cross About. They have a realisation that your arguments are just as lame and stupid as theirs. At that point you will feel like a total doofus and realise that if you want to retain any tiny shred of moral superiority you'd better not let the kids catch you bickering about who hogged the duvet last night.