What relation would your father's sister's sister-in-law be to you?

Your father's sister is your aunt (called 'anti' in the question, which is a play on 'aunt'). Her sister-in-law could be your father's wife - which would be your mother. If your father's sister is married, her sister-in-law (through her husband) could also be your mother. Thus, the answer is 'Your mother'. Option B 'Your anti' is a humorous play on 'aunt' but is incorrect.