Your Momma took to shouting
Your Poppa's gone to war,
Your sister's in the streets
Your brother's in the bar.
The thirteens. Right On.
Your cousin's taking smack
Your Uncle's in the joint,
Your buddy's in the gutter
Shooting for his point
The thirteens. Right on.
“Joint” is a slang term for being locked up in a jail cell. His Uncle has had the same problems as other members of the family, but has been caught by the law unlike the rest.
The Thirteens Black