In a certain code language,

'A $ B' means 'A is the mother of B',

'A # B' means 'A is the father of B',

'A ! B' means 'A is the sister of B',

'A @ B' means 'A is the brother of B',

'A * B' means 'A is the wife of B',

'A > B' means 'A is the husband of B',

'A % B' means 'A is the father-in-law of B',

'A ^ B' means 'A is the mother-in-law of B'.

Based on the above, how is U related to A if

a) 'P > Q $ R > S ! T',

b) 'U # T',

c) 'R # A' ?