@OkPedro, most people skin up inside, even if they light up outside.
Grinding is more efficient than crumbling, especially if you've got weed and seed or a fuckton of buds, but that carries the risk of putting a hell of a lot more in because it's harder to see how much is laying on the tobacco, so it doesn't end up saving any money in the end. I could describe the process involved in chasing - it's a lot different to skinning up - but it's not relevant here, so why you think I'm referring to that when I'm not using the appropriate terminology for it is beyond me.
To spend 15 minutes outside toking, it's not going to be a single paper - might be threes, might be kingsize blues, might be rips - which means much more is being added, too - tobacco as well. It won't be exactly the same amount as in a single with roach that takes 5 minutes.
But nursery age kids do pick up on the process, even if you think they have no idea it's going on - they're great mimics.
If he got an electric vaporiser (not a vape pen with oil), he'd use far less and wouldn't piss off the neighbours - who wants the smell of skunk every night especially as solid has gone the way of Spangles and decent Dairy Milk ?, but he would be far more likely to have a whitey, as it's deceptively gentle - he'd also be doing it inside and they aren't cheap to buy, although if he stopped smoking tobacco altogether, that would easily cover the cost of the machine within two months.
Does he pick up or does somebody come round? Either way, he's likely at some point to become noticed (if nothing else, by the smell) and if the neighbour is that angry, it's not much of a leap to think that he isn't beyond making a false report of dealing coming from your flat.
I just don't think it's worth it when there is a pissed off neighbour and a kid that needs clothes, shoes and food in the home.