Asking to see a bill from a family member

They are inwardly impressed that you asked, or at least, should be.

There are other reasons you even asked...one or more of them (I'm assuming these are your parents) has given you reasons to doubt them.

When they show you the bill and you guys figure this out, thank them for putting your mind at ease. If it happens to calculate that they are giving you a better deal than you thought, thank them. If you are, in fact, getting hosed, be humble about it and thank them for showing you. They should be embarrassed enough at that point to fix things.

Start with a humble, inquisitive approach. If greeted with arrogance, ask them why they are so defensive.

Lastly, money is usually the only way parents have to control young adults. Get out of school ASAP and start making your own big bucks so you'll never need them again.

You have every right to that bill. Sort of like expensing items through work. Different circumstances but same scenario.

I wouldn't pay anymore unless I myself saw the bill. If they were insulted, they're obviously trying to make you feel guilty for not "trusting" them because they are doing something else with the money. Just my take.