In a certain code language,

A + B means ‘A is the mother of B’
A - B means ‘A is the son of B’
A x B means ‘A is the daughter of B’
A ÷ B means ‘A is the brother of B’

Based on the above, how is P related to T if ‘P - Q ÷ R x S + T’ holds?

We need to check for P - Q ÷ R x S + T with the given set of relational operators.
P - Q means that P is the son of Q.
Q $$\div$$ R means Q is the brother of R.
R x S means R is the daughter of S.
S + T means S is the mother of T.

Thus, we get the following family tree:

Here, (+) sign denotes male, and (-) sign denotes female. 

Q, R, and T are siblings, and Q is the brother of T.
P is the son of Q.
Thus P is the son of T's brother.
Option A is correct.