In a certain code language,

‘A × B’ means ‘A is the son 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’.

How is M related to T, if ‘M + N – P × S % T’?

​‘A × B’ means ‘A is the son of B’

​‘M + N – P × S % T’

So, M​is T’s brother’s wife.

Thus, the correct option is: (b)