Let me channel Mom for a moment: I know you never pay attention when I talk so let me remind you for the last time (I mean it. Take those ear-pods out.) that as of the end of January, anyone who is 19 or older (really, 19 or older; your fake ID age doesn't count) will need to show proof of citizenship when entering the good old US of A: 1) if by land, or 2) if by sea.
You already have to show a passport if you are coming in by air.
Now what do we mean by "proof"? You'll need either a birth certificate and some government-issued ID like a driver's license, or if you have a passport you're covered for both.
Your little brother and his pals who are under 18 will just need the birth certificate. (Stop smirking. No, he was not cloned at Beth Israel).
These new rules will apply to all border crossings, including Canada, Mexico, and the Caribbean. (Yes, Spring Break in Cozumel counts).
Probably some time this summer the rules will change again, and everyone will be required to have passports. There will likely be another rush to get them as there was last spring when the wait times got ginormous.
So, young man, it would make sense just to get a passport now. Right? And stop slouching. Do you want your back to stay that way?