Another piece of info that might make sense to add to this thread (and info I don't have) is: how are redemptions from household accounts calculated? I can't figure out how this works - it's not like a specific person's miles get drained first. There seems to be an allocation per person's account, but it's one I don't understand.
To many, it may not matter, but in the event you'd want to later book an award for someone who isn't in your household, you have to remove the household feature, and then each former participant is left with some unusual amount of miles. If you could organize the household redemption to keep the leftover miles in one person's account, that would be most efficient.