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1.
The research of your family history. Searching to find out who your forfathers were and where they were from. Keeping a record or tree of where your genes originated from.

THE 1ST GENERATION
1--yourself

THE 2ND GENERATION (2-3)
2--father
3--mother

THE 3RD GENERATION (4-7)
4--grandfather, (your fathers father)
5--grandmother, (your fathers mother)
6--grandfather, (your mothers father)
7--grandmother, (your mothers mother)

THE 4TH GENERATION (8-15)
8--great grandfather, (your grandfathers father)
9--great grandmother, (your grandfathers mother)
10--great grandfather, (your grandmothers father)
11--great grandmother, (your grandmothers mother)
12--great grandfather, (your grandfathers father)
13--great grandmother, (your grandfathers mother)
14--great grandfather, (your grandmothers father)
15--great grandmother, (your grandmothers mother)

THE 5TH GENERATION (16-31)
THE 6TH GENERATION (32-63)
Each time you add a generation the numbers double. Number 1's father is #2, his grandfather is #4 and great grand father is #8. If you want their wives you add one to the number.

You can add as much info to your trees as you like such as Medical History, Birth/Death Dates/Places, Siblings, Children.
An easy way to remember how to start a genealogy chart is to keep the men on all EVEN numbers and the women on all ODD numbers.
by KRYSANN November 03, 2006
 
2.
When you do some serious (most often sexual) research among several family members.
"So you slept with both Nana and her sister?"
"Are you serious? What would that be? Genealogy?"

alt.

That show "OC" or that movie "The Graduate".
by Jonas March 01, 2005