first off - I just replied to your PM
secondly, I recall Bungie stating one beta code per xbox.
since your household has 2 xboxes you should be okay. Otherwise it's probably just a case of everyone trying to get on at the same time?
I'm still downloadong it myself. shouldn't take too much longer I hope, seems to be going fine so far and i've paused and resumed a few times.
we'll have to try catch up during the weekend if things go smoothly.
one thing is for certain - Bungie could have made things more clear from the begining.