This series of Outnumbered seems real enough to me as a mum of 2 teens similar in age to Jake and Ben. As parents we are not as inept (I hope) and I have DD not DS and no younger Karen so some of the issues do not occur.
They each have keys, if they lose them/forget them they either have to sit outside/in the garage or hope that their aunt (lives 3 streets away) is in. We have only had to change the locks once.
I have been in meetings and receiving texts/calls but I do try to be professional and turn the phone off, this backfired on me when my DD1 decided to be unwell at school but fortunately as it is a senior school she was able to give alternative numbers to the office to call and her aunt was able to sort her out.
I hide my Oyster card, they don't use theirs regularly so if they are going to need them I start reminding them to find them at least a day in advance.
I'm taking a career break at the moment and both DDs and DH seem to think that this means I am now available errands so my life is a constant stream of collecting parts, taking cars to garages and of course managing the parental taxi service fine when it runs smoothly, not so good when you are across town in the pouring rain and DD misses the bus, so I really felt for Pete yesterday.