Relationship Chart | Clan Corrigan.ca

For a true ‘relationship’ to exist, there must be an ancestor who is common to both individuals. Examine the chart below, the Common Ancestor is Box 1 on the Horizontal Scale (HS) as well as Box 1 on the Vertical Scale (VS).

EXAMPLE: If you have a grandson of that common ancestor, as seen in Box 3 of the HS, and you want to know that grandson’s relationship to a great-granddaughter, seen in Box 4 on the VS.
Follow Box 4 (VS) across to where it meets the vertical pathway to Box 3 (HS), then where they cross tells you the relationship — they are first cousins once removed.

	1	2	3	4	5	6	7	8	9	10
1	Common Ancestor	Son or Daughter	Grand -son or -daughter	Great Grandson or -daughter	2nd Great Grandson or -daughter	3rd Great Grandson or -daughter	4th Great Grandson or -daughter	5th Great Grandson or -daughter	6th Great Grandson or -daughter	7th Great Grandson or -daughter
2	Son or Daughter	Siblings (Brother or Sister)	Nephew or Niece	Grand- Nephew or Niece	Great Grand- Nephew or Niece	2nd Great Grand- Nephew or Niece	3rd Great Grand- Nephew or Niece	4th Great Grand- Nephew or Niece	5th Great Grand- Nephew or Niece	6th Great Grand- Nephew or Niece
3	Grand -son or -daughter	Nephew or Niece	First Cousin	First Cousin Once Removed	First Cousin Twice Removed	First Cousin Three X Removed	First Cousin Four X Removed	First Cousin Five X Removed	First Cousin Six X Removed	First Cousin 7 X 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 X Removed	Second Cousin Four X Removed	Second Cousin Five X Removed	Second Cousin Six X Removed
5	2nd 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 X Removed	Third Cousin Four X Removed	Third Cousin Five X Removed
6	3rd Great Grandson or -daughter	2nd Great Grand- Nephew or Niece	First Cousin Three X Removed	Second Cousin Twice Removed	Third Cousin Once Removed	Fourth Cousin	Fourth Cousin Once Removed	Fourth Cousin Twice Removed	Fourth Cousin Three X Removed	Fourth Cousin Four X Removed
7	4th Great Grandson or -daughter	3rd Great Grand- Nephew or Niece	First Cousin Four X Removed	Second Cousin Three X Removed	Third Cousin Twice Removed	Fourth Cousin Once Removed	Fifth Cousin	Fifth Cousin Once Removed	Fifth Cousin Twice Removed	Fifth Cousin Three X Removed
8	5th Great Grandson or -daughter	4th Great Grand- Nephew or Niece	First Cousin Five X Removed	Second Cousin Four X Removed	Third Cousin Three X Removed	Fourth Cousin Twice Removed	Fifth Cousin Once Removed	Sixth Cousin	Sixth Cousin Once Removed	Sixth Cousin Twice Removed
9	6th Great Grandson or -daughter	5th Great Grand- Nephew or Niece	First Cousin Six X Removed	Second Cousin Five X Removed	Third Cousin Four X Removed	Fourth Cousin Three X Removed	Fifth Cousin Twice Removed	Sixth Cousin Once Removed	Seventh Cousin	Seventh Cousin Once Removed
10	7th Great Grandson or -daughter	6th Great Grand- Nephew or Niece	First Cousin Seven X Removed	Second Cousin Six X Removed	Third Cousin Five X Removed	Fourth Cousin Four X Removed	Fifth Cousin Three X Removed	Sixth Cousin Twice Removed	Seventh Cousin Once Removed	Eighth Cousin