In a certain code language,
‘A + B’ means ‘A is the mother 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 father of B’.

Based on the above information, how is S related to U if ‘P + Q ÷ R × S − T ÷ U’?

Let's decode the expression ‘P + Q ÷ R × S − T ÷ U’ step-by-step from left to right:
P + Q → P is the mother of Q. (P is Female)

Q ÷ R → Q is the father of R. (Q is Male)

R × S → R is the wife of S. (R is Female, S is Male)

S − T → S is the brother of T. (S is Male)

T ÷ U → T is the father of U. (T is Male)

Now let's trace the relationship between S and U:

T is the father of U.

S is the brother of T.

Therefore, S is the brother of U's father, which means S is U's Father's brother.