C ಗೆ ಯಾವುದೇ ಮಗಳಿಲ್ಲ, B C ಯ ಏಕೈಕ ಮಗ. K ಯು C ಯ ಮೊಮ್ಮಗನ ಪತ್ನಿ. K ಗೆ B ಏನಾಗಬೇಕು?

C has no daughter and B is the only son, so every grandson of C is B's son. K is the wife of B's son, which makes B her father-in-law.