delete cascade not working

My noob understanding is that deleteing one of these:

CREATE TABLE provider_input.file_load
(
sid serial NOT NULL,
file_name_full text,
file_name text,
file_creation_date text,
load_universal_time numeric,
headers text,
date timestamp without time zone DEFAULT now(),
CONSTRAINT file_load_pkey PRIMARY KEY (sid)
)

Given constraint:

ALTER TABLE provider_input.common
ADD CONSTRAINT common_pin_file_load_sid_fkey FOREIGN KEY
(pin_file_load_sid)
REFERENCES provider_input.file_load (sid) MATCH FULL
ON UPDATE NO ACTION ON DELETE CASCADE;

Would cause any of these referring to the file_load to be deleted:

CREATE TABLE provider_input.common
(
sid serial NOT NULL,
pin_file_load_sid integer,
load_row_no integer,
CONSTRAINT common_pin_file_load_sid_fkey FOREIGN KEY (pin_file_load_sid)
REFERENCES provider_input.file_load (sid) MATCH FULL
ON UPDATE NO ACTION ON DELETE CASCADE
)

...but I just tried it and the file_load is gone but not the items that
referenced it. Two things that might matter:

I am using pgAdminIII to do the delete

I do not actually instantiate common, I have a table that inherits from
that. I will play around now to see if that is an issue, thought I'd
send up a flare here at the same time.

kt