Oh, there's a really good pre-series one in which John agrees to give Dean custody in case they have problems while John's on a hunt. It turns out to be a brilliant idea when Sam's principal thinks he's being abused & calls his CPS buddy. It's sweet and funny and in character. At one point, the boys are like, "Yeah, sure our dad beats us [he doesn't]. But he doesn't have custody, so what are you gonna do about it?" Look under the CPS tag & I'm almost positive you'll find it. Dean works in a bar, and Sam is ~17.