In a certain code language,
C + F means 'C is the father of F',
C - F means 'C is the sister of F,
C @ F means 'C is the brother of F',
C # F means 'C is the mother of F'.
If A # K + J @ T, then how is J related to A?
1
Brother
2
Son
3
Father's brother
4
Son's son