On the top row, find the relationship of one person to the common ancestor and follow the column straight down. Find the second person's relationship to the common ancestor on the left hand column and follow that row straight across. The relationship between the first and second person is where the projected row and column cross.
CA
Common Ancestor
S
Sibling (brother or sister)
C
Child
N
Niece/Nephew
GC
Grand Child
GN
Grand Niece/Nephew
GGC
Great Grand Child
GGN
Great Grand Niece/Nephew
#C
# Cousin (1C - 1st cousin, 2C - 2nd cousin, etc.)
#R
# of times removed (1R - once removed, 2R - twice removed, etc.)
(Based on the system used by courts and most genealogical societies.)
0
1
2
3
4
5
6
7
8
9
10
2 GGC
3 GGC
4 GGC
5 GGC
6 GGC
7 GGC
8 GGC
2 GGN
3 GGN
4 GGN
5 GGN
6 GGN
7 GGN
1C
1C 1R
1C 2R
1C 3R
1C 4R
1C 5R
1C 6R
1C 7R
1C 8R
2C
2C 1R
2C 2R
2C 3R
2C 4R
2C 5R
2C 6R
2C 7R
3C
3C 1R
3C 2R
3C 3R
3C 4R
3C 5R
3C 6R
4C
4C 1R
4C 2R
4C 3R
4C 4R
4C 5R
5C
5C 1R
5C 2R
5C 3R
5C 4R
6C
6C 1R
6C 2R
6C 3R
7C
7C 1R
7C 2R
8C
8C 1R
9C
From CompuServe's Genealogy Forum