This may help you work out what relations other members of your family are to you.
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great-grand- uncle or aunt |
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grand-uncle or grand-aunt |
first cousin twice removed |
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uncle or aunt |
first cousin once removed |
second cousin once removed |
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brother or sister |
first cousin | second cousin | third cousin | |||
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son or daughter |
nephew or niece |
first cousin once removed |
second cousin once removed |
third cousin once removed |
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grandson or granddaughter |
grand-nephew or grand-niece |
first cousin twice removed |
second cousin twice removed |
third cousin twice removed |
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To find what cousin another member of your family is to you, find the nearest common ancestor, such as a grandfather or a great-grandfather. Count the number of generations that you and your cousin are from the ancestor. If you are the same number of generations from the ancestor as your cousin, then you are first, second, third or more cousins, where the number is one less than the number of generations that you and your cousin are from the ancestor.
For example, if your nearest common ancestor is your great-grandfather, three generations away, you are second cousins.
If your cousin is a different number of generations from the ancestor, then you are first, second, third or more cousins, where the number is one less than the number of generations that the nearer of you and your cousin is from the ancestor. Your cousin is 'removed' by the number of generations he or she is away from your generation.
Your father's cousin is your first cousin once removed, and so is your cousin's son. If you wish to differentiate, your father's cousin is your first cousin once removed ascending and your cousin's son is your first cousin once removed descending.