I do, as many others above! What a way of extrapolating your life to everyone.
We wake up at 8am. DH makes breakfast for the kids while I have a shower. When I finish, DH has the shower and I go down and check the uniforms, bags, sort out last bits. We walk to school 8:45am. It's around the corner so we can be back home at 9am for WFH. If DH has to go to the office, he leaves at 8:30am instead of walking to school. If I have to go to the office, I take the train after dropping kids off at school. I arrive at 9:40 am but my work is flexible and I can just work those minutes later that day, from home, or another day working through lunch, whatever.
At the weekend, we all stay in bed until 8-8:30am. My kids tend to also go to bed late, no matter what time they are up and ready for bed. We leave their room at 8am but they read until 9:30pm.
So for us, given our routine, which has been like this for years... 6:30am every day would be a massive change and we would all be exhausted and cranky. I would struggle myself and if I add to that a tired kid, I would be huffing and puffing throughout the day!
I would speak to my parents and explain that it's way too early for us, see what adjustments could be done. Could you put a mattress in the living room where the TV is, so your dad getting up for coffee don't disturb you, and he could watch TV at low volume? DH could then sleep in the guest room?