If A+B means A is the father of B, A-B means A is the wife of B, A x B means A is the brother of B, A/B means A is the daughter of B. If it is given D x E + F, which of the following is true?

A and B are Brothers. C and D are Sisters. A's son is D's Brother. How is B related to C?

A is the sister of B. B is the brother of C. C is the son of D. How is D related to A?

A reads a book and find the name of the author familiar. The author 'B' is paternal uncle of C. C is the daughter of A. How is B related to A?

P and Q are brothers R and S are sisters. P's son is R's brother. How is Q related to K?

Six persons are seen together in a group. They are A, B, C, D, E and F. B is the brother of D but D is not brother of B. F is the brother of B. C and A are married together. F is son of C but C is not the mother of F. E is the brother of A. The number of female members in the group is

Ram and Mohan are brothers. Shankar is Mohan's father. Chhaya is Shankar's sister. Priya is Shankar's niece. Shubhra is Chhaya's granddaughter. How is Ram related to Shubhra?