What milestone did the Indian Railways achieve in February

Is S is brother in law of K?

I)  S is the only son of Q, who is mother in law of K. S is unmarried. D is daughter of P.

How is A related to B?

I  C has only two kids A & B and is father-in-law of D who is brother-in-law of B

How is B related to C?

I. C and D are the sons of E. B is son of E’s father.

II. E is sister of B and mother of D, who is brother of C.

In the family of five members there are two married couples and three generations, who is the wife of F?

A is in which direction with respect to B?

How is Gaurav related to Preeti?

I. Shekhar and Gaurav are the two sons of Raj and Preeti is the daughter of Shekhar.

Six persons J, K, L, M, N and O are sitting around a circular table, are they all facing the centre?

How many days did Lalit take to complete his project?