'A + B' means 'A is the father of B' 'A – B' means 'A is the mother of B' 'A × B' means 'A is the husband of B' 'A ÷ B' means 'A is the sister of B' If C ÷ M – S – K + T × Q, then which of the following statements is not correct? MCQ with Answer and Explanation

C ÷ M → C sister of M. M – S → M mother of S. S – K → S mother of K. K + T → K father of T. T × Q → T husband of Q. K is father-in-law of Q (true). S is mother of K, so S is not father of T's father. Hence B is incorrect. C: S is daughter of C's sister M (true). D: M is mother of S, who is mother of K, so M is mother of K's mother (true).