Kid's stuff isn't really spending money though is it? It's joint essentials.
What may help with awareness is:
Going through some previous months to find out what exactly was spent and where
Giving yourself a specific budget for specific things (like coffee and haircuts), then noticing when you want/need to spend outside those categories, or if you're regularly overspending on categories - you might be spending more than you think OR maybe you can cut down OR maybe you've just been unrealistic in your budget.
You also need to think about expenses that happen less often - so when the kids need a new coat, or new shoes, that is much more of a spend than when you see a t-shirt or pair of leggings or PJs for them that's cute and pick it up. Or if you buy their clothes in bulk seasonally rather than in bits and bobs when you see sales etc, then you might need to budget for this specifically. I tend to budget about €20 per month for the teenager, which gets saved up and spent in bulk usually, and €25 per month for the 2 under 5 who are the same sex so can pass down clothes, therefore need to buy much less for the youngest, and their clothes are cheaper. I tend to buy theirs in dribs and drabs a couple of sizes ahead in sales or on multibuys or second hand. However the older one is getting more fussy, so I am less able to do this as I am finding some stuff gets to the size he is currently and he just says nope, don't want to wear that. Then I have to decide whether to store it for the youngest or try to sell it and make a bit of money back.
And often you'll find that a whole load of money that you thought was just spare and can't understand where it is going, is actually going on unavoidable but infrequent, sometimes unplanned, expenses like the toaster dies and you need to replace it, or the car needs repairs, or the dog needs vet treatment, or you travel to a family party, or the amazon prime subscription came out and you forgot, or it was Christmas or a kid's birthday etc etc. I don't know about you but I used to have a really bad habit of thinking "Oh but that wasn't a normal month because we had that expense! Next month will be better" BUT I never actually compensated for it the next month, I just carried on spending to the plan I had set which assumed all that money WAS actually "just spare". AND I didn't recognise that basically every month, or something like 9-10/12 months HAVE some kind of "not normal so I'll just ignore it" expense, and I needed to be budgeting for them.
It can help to look at these expenses over a year, especially the ones which will definitely recur, and plan out an amount to keep aside for them, and the ones which are unexpected but necessary have a look how much they cost you over the last year, and keep a slush fund for those. This was the secret for me from going with being bad with money/not really understanding where money went to being much better at managing it to the point we can actually save and not constantly go into debt any more. NB, this can be a tough realisation if you always run out of money, because it may be that once you take these expenses into account, you realise that your income does not actually cover all of your expenses as you thought it did.
YNAB has helped me to all this and stick to it but you can do it yourself without paying for a program. I find the program is worth it because somehow it seems to help me stick to it better than not using it. There are some good free budgeting tools on MoneySavingExpert if you wanted to start there.