That would be your Cousin.
Your father's brother's son is your first cousin and your daughter's second cousin.
Your father's sister is your aunt. Her son is your first cousin. Her grandson is your first cousin, once removed.
cousin
Your cousin.
cousin
cousin!
Nonexistent, since my father doesn't HAVE a brother.However, hypothetically speaking, my father's brother's child would be my first cousin.
Your mother's sister's daughter is your first cousin. Your first cousin is not related to you. You would call him by name, or refer to him as "my cousin's husband."
Your grandfather's first cousin in your first cousin, twice removed.
Your first cousin is your son's first cousin, once removed.
Your uncle's grandchild would be your second cousin because his grown son or daughter would be your first cousin.