Actually I don't believe 'there is no such thing as a bad dog, only bad owners'. All dogs are different, so it stands to reason some are bad. Bad dogs are more difficult to cope with, so one tend to cause more problems (or incidents!). I think they generally don't have a moral compass, so they are not deliberately evil, but definitely some are far more difficult to deal with than others. And to be honest as a parent (I feel) one should be prioritising the family's needs over the dogs anyway.
Anyway, off my soap box!! just wondered, op, if yours were hungry? I've just been watching mine being a complete arse (chewing etc) and realised it was dinnertime!! She is now fed, collapsed and asleep. Only as it seemed this incident was early morning, just thought they might be thinking of breakfast, young one particularly. I don't know labs (have a Dalmatian) but understand they are similarly always hungry, so probably difficult to tell!!! Always thought labs were quite laid back myself and have heard tales of them being reluctant to walk. I've not previously heard they need 2 hours a day minimum, unlike a collie that definitely would, however would agree that they are probably under stimulated and could do with extra attention, whether it be walking or some form of training to get their brains working. Allegedly brain work tires them out quicker than walking, so may be something to look into, especially in the inclement days of winter.
Also, just a thought, the young one is maybe doing the 'terrible teens' and may, if you keep on top of the training, grow out of it. Of course it may be the old one causing the trouble, in which case I'm talking rot, feel free to ignore!
Anyway, my sympathy with dealing with kids, work and dogs. It isn't easy at the best of times, hope you get something sorted, dog walker might just be enough to take the pressure off you.