Pointing towards a boy, a lady said, "he is only son of my father’s wife only daughter”. How is the lady related to boy?

A is son of B while B and C are the sisters to one another. D is the mother of C. If E is the son of D, which one of the following statements is correct?

Riju introduces Rivu as the son of the only brother of his father’s wife. How is Rivu related to Ridge?

Amit, Gaurav, Hatim, Varun, Yukti and Zaid are sitting in a straight line, all facing the north. Gaurav is fourth to the left of Amit. Yukti is sitting at one corner. Hatim is fourth to the left of Yukti. Zaid is third to the right of Gaurav. Who is sitting at the second place to the left of Zaid?

A family has 6 members P, Q, R , S , T and U. Q is the son of R, but R is not the mother of Q. P and R are a married couple. T is the brother of R. S is the daughter of P. U is the sister of Q.

Who is the son of P ?

A lady said that father of Rahul’s father is my father. How is the lady related to Rahul?

C is the mother of A and B. If D is the husband of B, then who is C to D?

Pointing toward’s a boy, a girl said that he is the only son of my paternal aunt's daughter. How will my brother’s only daughter is related to that boy?