GACHGS.COM | Relationship Chart

For a true “relationship” to exist, there must be an ancestor who is common to both individuals. If you examine the chart below, for example, the Common Ancestors is Box 1 on the horizontal scale (HS) as well as Box 1 on the vertical scale (VS).

Let us suppose that you have a grandson of those common ancestors, as seen in Box 3 of the HS, and you want to know that grandson’s relationship to a great-granddaughter, who would be seen in Box 4 on the VS. If you follow Box 4 (VS) down to where it meets the vertical pathway to Box 3 on the HS, then where those paths cross, it tells you the relationship—they are first cousins once removed. If the grandson and great-granddaughter were common descendants of only one of the common ancestors, then they would be half-first cousins once removed.

	1	2	3	4	5	6	7	8	9	10
1	Common Ancestors (husband and wife)	Son or Daughter	Grandson or daughter	Great Grandson or daughter	2^nd Great Grandson or daughter	3^Rd Great Grandson or daughter	4^th Great Grandson or daughter	5^thGreat Grandson or daughter	6^thGreat Grandson or daughter	7^thGreat Grandson or daughter
2	Son or Daughter	Siblings (brother or sisters)	Nephew or Niece	Grand Nephew or Niece	Great Grand Nephew or Niece	2^nd Great Grand Nephew or Niece	3^rd Great Grand Nephew or Niece	4^th Great Grand Nephew or Niece	5^th Great Grand Nephew or Niece	6^th Great Grand Nephew or Niece
3	Grandson or daughter	Nephew or Niece	First Cousin	First Cousin Once Removed	First Cousin Twice Removed	First Cousin Three Times Removed	First Cousin Four Times Removed	First Cousin Five Times Removed	First Cousin Six Times Removed	First Cousin Seven Times Removed
4	Great Grandson or daughter	Grand Nephew or Niece	First Cousin Once Removed	Second Cousin	Second Cousin Once Removed	Second Cousin Twice Removed	Second Cousin Three Times Removed	Second Cousin Four Times Removed	Second Cousin Five Times Removed	Second Cousin Six Times Removed
5	2^nd Great Grandson or daughter	Great Grand Nephew or Niece	First Cousin Twice Removed	Second Cousin Once Removed	Third Cousin	Third Cousin Once Removed	Third Cousin Twice Removed	Third Cousin Three Times Removed	Third Cousin Four Times Removed	Third Cousin Five Times Removed
6	3^Rd Great Grandson or daughter	2^nd Great Grand Nephew or Niece	First Cousin Three Times Removed	Second Cousin Twice Removed	Third Cousin Once Removed	Fourth Cousin	Fourth Cousin Once Removed	Fourth Cousin Twice Removed	Fourth Cousin Three Times Removed	Fourth Cousin Four Times Removed
7	4^th Great Grandson or daughter	3^rd Great Grand Nephew or Niece	First Cousin Four Times Removed	Second Cousin Three Times Removed	Third Cousin Twice Removed	Fourth Cousin Once Removed	Fifth Cousin	Fifth Cousin Once Removed	Fifth Cousin Twice Removed	Fifth Cousin Three Times Removed
8	5^thGreat Grandson or daughter	4^th Great Grand Nephew or Niece	First Cousin Five Times Removed	Second Cousin Four Times Removed	Third Cousin Three Times Removed	Fourth Cousin Twice Removed	Fifth Cousin Once Removed	Sixth Cousin	Sixth Cousin Once Removed	Sixth Cousin Twice Removed
9	6^thGreat Grandson or daughter	5^th Great Grand Nephew or Niece	First Cousin Six Times Removed	Second Cousin Five Times Removed	Third Cousin Four Times Removed	Fourth Cousin Three Times Removed	Fifth Cousin Twice Removed	Sixth Cousin Once Removed	Seventh Cousin	Seventh Cousin Once Removed
10	7^thGreat Grandson or daughter	6^th Great Grand Nephew or Niece	First Cousin Seven Times Removed	Second Cousin Six Times Removed	Third Cousin Five Times Removed	Fourth Cousin Four Times Removed	Fifth Cousin Three Times Removed	Sixth Cousin Twice Removed	Seventh Cousin Once Removed	Eighth Cousin