Read the following passage and solve the questions based on it.
Six people—P, Q, R, S, T and U are X’s husband, sister, son, daughter, mother and aunt, though not necessarily in that order. They satisfy the following conditions:
(i) R and S are either both males or both females.
(ii) Either P or Q, or both are male.
(iii) Either T or U, or both are female.
Which of the following statements must be false?