Johnny was born just after WWII.

Johnny was an accident (they wouldn't beat him if they WANTED him).

Johnny's father drinks a lot.

Why would someone who's married and likely in their forties or fifties drink a lot?

to forget about something or dull something.

What would he want to dull or forget?

he's in charge at home.

he likely has enough money, seeing as Johnny is not starving and he's in school.

lets go back a few steps.

Johnny was born just after WWII.

Johnny was an accident.

a baby boom happens when soldiers come home to their families.

Things happen the night a soldier comes home from war.

Johnny's father was in WWII.

just a theory.

but still.