I have to say upfront a southerner i worked with told me this joke while i was stationed in Mississippi.
Heres the short version, its a reference to the sterotypical southerners family tree:
Young man goes to his father and announces he's getting married. He tells his father about his bride to be, and that It'll be a white wedding as she's still a virgin. To which his father replies, "Boy whats wrong with you! If she ain't good enough for her family, what makes you think she's good enough for ours?!?!"
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