Top definition
When a diagonal line is drawn in you family tree inferring that incest has occurred.
"Did you see how ugly that kid is?"
"Yea, I bet he has an Alabama Family Tree"
by Hoophy October 26, 2011
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2
A family tree in which the parents continue to produce a daughter and a son, that get married to each other and also have a daughter and a son, this continues. The family tree ends up looking like two vertical straight lines next to each other.
He has such a diverse background, almost like the opposite of an Alabama family tree
by Stoven Logg January 11, 2017
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