Yeah, that sucks to hear that brother. You would hope that a kid would wake the hell up by that age. But some never do. It blows that you have to clean up his $hit.
It doesn't help, for what it's worth, but I'm the youngest of three boys (I'm 55), and the other two are worthless, with the middle brother being a complete Fuk-up. And he always was.
So like I said. Some will never grow out of it.
I count myself lucky that the two evil spawn that came from my loins have actually turned out to be pretty ok. Though I would never tell them that. A practice that any real father would follow.