Answer-Which of the following is definitely false?

Question

Which of the following is definitely false?

Answer the questions based on the information given below. There are nine members
i.e., D, N, U, S, R, T, A, C and I in a family of three generations such that there are three married couples. No single person in the family is a parent. D is father of I’s mother. T is married to A and has two children. U is only granddaughter of S. R is son-in-law of D, who has two daughters. N, who is not in third generation, has a sister. T is not a brother-in-law of N.

A R is father of I

B A is brother-in-law of N

C D is father of T

D C is only son of A

E None of the above