So Bad I Can't Even Keep the Characters Straight Spoilers

So there's Eve aka Studder Girl aka Scar Face

Little Girl from Halloween as her older sister.

Blonde Guy as older brother. Possibly the nice kid from the first scene. Or the tractor driver

*****
Blonde Sister who's screwing her sister's old boyfriend

Brown haired sister pining for old boyfriend

Brown haired mom who seems nice, but arrive in the final act to add body count
*****
Boyfriend having a love triangle with the sisters. Overly protective of his younger sister

Sister slutty Same girl from the masturbation scene? Likely 2 of the kids.
*****
Slutty Sister's boyfriend Do not think he was one of the kids, but's on the list for unknown reason/s.
*****
Ashley also wants the boyfriend from the sister triangle. Pot head pines for her. Likely one of the kids

Ashley's Mom? See Brown Haired Mom
*****
Pot Head Does nothing but pine for Ashley, and annoys everyone. Doesn't seem to be one of the kids, but the peeping tom act adds him to the list.
*****
2 Pot Head Finds the dead bodies, and thinks it's part of the show 'humorously'
Not killed despite being part of the Peeping Tom

Employee lady with glasses. Left alive by killer only to be killed during the credits despite not being one of the kids
*****
Male Employee Red hearing killer just pops up randomly like everybody in the film


As you can see I have gaps in those characters, but then another guy who looks like Boyfriend number one shows up and gets his head cleaved. The other boy from the cornfield? 80% of the movie goes by then shows up to die 10 seconds later?

Can anybody clarify this trainwreck for me?