I'm one of 8, it can get pretty hectic. When i still lived at home whoever was in the kitchen gave the little ones breakfast and if kids were ready when me or the other older ones left for school/college/work we'd often take them to school while mum was getting herself ready/sorting other kids, we just used to shout up the stairs 'bye mum, I'm taking 4 &5 to school.' It says in the article his brother is 20, so there are other adults in the house, maybe they have a similar system.
Mostly our system worked but 7 went missing once, turns out 5 accidentally locked him in the shed and he'd dozed off. i say accidentally, 5 says it was an accident, I'm not sure it was.
5 was found in the wheelie bin once too (not sure if i know Wish) but no one looked for him, he just gave me a heart attack when i took the rubbish out, apparently he'd been waiting in there for over an hour, he was quite offended we hadn't noticed.