Ok, so redneck Joe gets 18 years old and he starts to like this girl in his trailor park named Sue and he's going out with Sue for a year and he tells his dad he's in love with her and he wants to marry her.
His dad takes him aside and says "Son, I have to tell you this, you can't marry that girl Sue, 'cause she's really your sister." Joe is shocked and upset, but he gets over it.
A year goes by and he likes another girl, Ann. He starts going out with her for a year and he tells his dad he really loves her and he wants to marry her.
His dad takes him aside and says "Son, I have to tell you this, you can't marry that girl Ann, 'cause she's your sister as well." Joe is really upset now and screams "That's it, I'm telling mum about you cheating on her all the time!!"
So he goes off to tell his mum and he says to her "Mum, I've been going out with Sue and wanted to marry her, but then dad tells me she's my sister, then I've been going out with Ann and dad told me the same thing, I am so pissed off at him, because now I can't marry either one of those girls."
His mum laughs and says "Don't listen to him, he's not really your dad."