Who’s Who In Your Family
Your first cousin is your parent’s brother’s (or sister’s) child. However the first cousin’s child is not your second cousin as is sometimes thought to be the case, but your first cousin once removed. The child of the first cousin once removed is your first cousin twice removed, and his child your first cousin three times removed.
Your second cousin is your grandparent’s brother’s (or sister’s) grandchild. That second cousin’s child is your second cousin once removed, his child your second cousin twice removed
Your third cousin is your great grandparent’s brother’s (or sister’s) great grandchild. The third cousin’s child is your third cousin once removed, his child your third cousin twice removed
Your first cousin is your parent’s brother’s (or sister’s) child. However the first cousin’s child is not your second cousin as is sometimes thought to be the case, but your first cousin once removed. The child of the first cousin once removed is your first cousin twice removed, and his child your first cousin three times removed.
Your second cousin is your grandparent’s brother’s (or sister’s) grandchild. That second cousin’s child is your second cousin once removed, his child your second cousin twice removed
Your third cousin is your great grandparent’s brother’s (or sister’s) great grandchild. The third cousin’s child is your third cousin once removed, his child your third cousin twice removed