Use the chart below to determine the relationship between two family members.
1. The box marked CA in the upper left-hand corner is the closest common ancestor of two people.
2. Identify the relationship of the first person to the common ancestor, e.g., child, grandchild, 5th great grandchild, etc. Find that box on the top row.
3. Identify the relationship of the second person to the common ancestor, e.g., grandchild, great grandchild, 3rd great grandchild, etc. Find that box in the left-hand column.
4. Follow the column straight down from the top row and follow the row straight across from the left-hand column. The relationship of the second person to the first person will be the box where the two lines meet.
 
CA C GC GGC 2 GGC 3 GGC 4 GGC 5 GGC 6 GGC
C S N GN GGN 2 GGN 3 GGN 4 GGN 5 GGN
GC N 1C 1C 1R 1C 2R 1C 3R 1C 4R 1C 5R 1C 6R
GGC GN 1C 1R 2C 2C 1R 2C 2R 2C 3R 2C 4R 2C 5R
2 GGC GGN 1C 2R 2C 1R 3C 3C 1R 3C 2R 3C 3R 3C 4R
3 GGC 2 GGN 1C 3R 2C 2R 3C 1R 4C 4C 1R 4C 2R 4C 3R
4 GGC 3 GGN 1C 4R 2C 3R 3C 2R 4C 1R 5C 5C 1R 5C 2R
5 GGC 4 GGN 1C 5R 2C 4R 3C 3R 4C 2R 5C 1R 6C 6C 1R
6 GGC 5 GGN 1C 6R 2C 5R 3C 4R 4C 3R 5C 2R 6C 1R 7C
 
CA   common ancestor
C   child
GC   grandchild
GGC   great grandchild
S   sibling (brother or sister)
N   niece or nephew
GN   grand niece or nephew
GGN   great grand niece or nephew
#C   cousin relationship, e.g. 1C = first cousin, etc.
#R   # of times removed, e.g. 4R = 4 times removed, etc.

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