11y Y6 or Y7?
Makes a huge difference.
I still tried to chase DD2 Y6 to bed by 9.30, in Y7 it was likely to 10-10.30 and I really stopped worrying.
She has a night owl big sister and instilling an earlier bedtime just because DD2 is younger has never been worth the hassle, since She is the one who bounces up in the morning.
Tea varies due to after school stuff and wether it's something that's easier to do when DH is back or not. ie. 4.30-7.30pm
Discipline, I shout, I send DDs to their room, but in all honesty I'm very lucky, both my DDs are very reasonable most of the time.
DD2 was cheeky and awkward at 9/10, as many DC are, but with the freedoms and responsibilities of Y6/Y7, especially being able to stay home on her own, walk to the shop etc. she felt less babied and suddenly grew up. One day after a spectacular out if control tantrum she just said sorry and never (touch wood, she's now 13, did it again).
Very occasionally, due to not putting washing away, her lap top walls for a few hours.
In any case both DDs know that I hold the ultimate card. We live in the middle of nowhere. No mummy taxi, no fun. Neither has ever choose to em vole that one.