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.
This line has the possibility of two meanings as used in the context. The father could literally be in the middle of a war in a different country or the father could also be in a war in the household, the reason why the Mother is screaming.
The Thirteens Black