Hey. Firstly, calm down. Best thing you can do in a crisis is keep a level head.
You haven't described what the tweeter is doing. Is it buzzing, humming, or just not working at all.
If you are sure the tweeter is blown, I would order the new one and see how it goes.
I was a sneaky kid, so I should probably counsel you to be honest with your dad, but I don't know your sitch. Will he know the tweeter is blown? If so can you disconnect it till the new one comes so it isn't making an offensive buzzz............?