@Springinabundance
I thought you were going to say it was a neighbour that was waking you up everyday at 6:30 AM with their car revving up, and ticking over for 15 minutes or so, with shouting and hollering and whistling under your bedroom window or something!
It's just your parents staying for 10 days, It's a very short amount of time. And I think you need to suck it up this time. I also don't understand (as quite a few posters have said,) how you lie until 8:00 AM, when you've got a child to get to school, and a job to get to.
I've got two kids (now grown,) and I was always up between 6:45 and 7:00 AM, because there's no way in hell that I would have been able to leave the house at 8:15-8.20 AM to take them to school otherwise. You say (later in the thread,) that your DD starts at 9.15 AM. That's a late start time isn't it? And you start at 9.30 AM. Even so, 8 AM is still quite late a time to wake, if you have to leave the house at 9 AM!
Of course, your dad's being a little bit inconsiderate, but he doesn't know if you don't tell him, does he? He probably doesn't realise the noise he is making. I also think you should be telling him and not your mom (as he is making the noise,)
I'm saying YABU. Because it's not a very long amount of time, you haven't told them, (so they don't know,) and I find it really hard to understand why you have a problem being woken at 6:30 with a four year old to get to school anyway. Surely most people would get up at 7 AM anyway with school kids. 6.30AM isn't that much earlier!