Where's my sister's friend? Oh, I forgot, we are in Alabama.
Sister's Friend in Alabama
Explanation
Explain Bear
Alright listen up, buttercup. This "joke" is basically poking fun at the stereotype that folks in Alabama, uh, like to keep it in the family, if you catch my drift. It's saying the sister's "friend" is probably her cousin... or something. You probably have a family tree that looks like a wreath.