Here is how I understand it:
Your uncle's child is your first cousin.
Your father's cousin is your second cousin.
Your grandfather's cousin is your third cousin.
You first cousin's child is your first cousin once removed.
Your father's cousin's child is your second cousin once removed.
Your grandfather's cousin's child is your third cousin once removed.
Your first cousin's grandchild is your first cousin twice removed.
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"You can't shoot a country until it becomes a democracy." - Willravel
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