where's my cake Bedelia?

Nathan Grantham: [beginning of a flashback sequence] Where's... my cake? I... want... my... cake! Where's my cake, Bedelia? Where's my Father's Day cake? I want my cake you dirty BITCH! I'm going to have it!
Nathan Grantham: [Nathan clacking his cane, bellowing] BEDELIA! It's Father's Day! Where's my cake? You promised me my cake! Bedelia, I'm your father and you're supposed to be taking care of me!
Bedelia Grantham: [distressed, almost driven to the point of madness] I DON'T HEAR YOU! I SAID I DON'T HEAR YOU!
Nathan Grantham: BEDELIA, YOU BITCH! What do you think I've got you here for? You're just like all the others - you're nothing but a bunch of VULTURES!
[Bedelia is in a highly distressed state, almost driven to the point of madness now]
Nathan Grantham: [still clacking his cane, the clacking sound has been slowly intensifying] BEDELIA! WHERE'S MY FATHER'S DAY CAKE?
Bedelia Grantham: [Bedelia picks up the marble ashtray and lifts it above her head, her father looking up at her in terror] HAPPY FATHER'S DAY!
Bedelia Grantham: [Bedelia bashes her father's head in with the marble ashtray, killing him instantly] .

Parents seem to believe that they have diplomatic immunity.
 certain ideologues state we are supposed to respect our parents unconditionally and more often than not this leads to a false sense of entitlement.
I don't get where a lot of entitlement comes from. Out of all the times in their life my parents had sex i resulted in one...i just got lucky.
In life we all want acknowledgement ... 
our"cake"
but "cake" should be earned...not distributed without having done anything to deserve it.
it's something that happens with fathers....post a divorce it seems like there is an expectation you'll be there for them unconditionally. They might ran off with someone else and abandon responsibility but still want the benefits that come with responsible parenting.
Maybe that's the real moral orel ofu the segment of "creepshow" in question. Your children aren't there for you to flaunt your perceived entitlement at so...you make your own cake.
so the real character growth comes from the reanimated corpse...
granted Bedelia progresses in achieving decapitation...but that's hardly positive growth.