$If 'P+Q' means 'P is the father of Q', 'P-Q' means 'P is the mother of Q', 'P\times Q' means 'P is the brother of Q', then which of the following is definitely true about 'C-A+B'?$

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?

A, B, C, D, E and F are members of a family. B is the son of A but A is not the mother of B. A and C are married couple. F is the brother of A. D is the sister of B. E is the son of C. How many male members are there in the family.