In a certain code language,
A + B means 'A is the mother of B'

A - B means 'A is the brother of B'

A x B means 'A is the wife of B'

A # B means 'A is the son of B'

Based on the above, how is W related to P if 'W x V # T - R + P'?

Let's decode the expression 'W x V # T - R + P' step by step from left to right:
W x V: W is the wife of V (⟹ V is the husband of W, W is female, V is male).

V # T: V is the son of T (⟹ T is the parent of V).

T - R: T is the brother of R (⟹ T is male, so T is the father of V. R is a sibling of T).

R + P: R is the mother of P (⟹ R is female, so R is the sister of T).

Now, let's determine the relationship between W and P:

T is the brother of R, and R is the mother of P ⟹ T is P's maternal uncle (mother's brother).

V is the son of T ⟹ V is P's maternal uncle's son (mother's brother's son).

W is the wife of V ⟹ W is the wife of P's mother's brother's son.

Thus, W is Mother's brother's son's wife to P.