BPSC 68th Prelims Exam 12 Feb 2023 Solved Paper

In a family of some persons, B says that R is the daughter of my sister A, who is the only daughter of T. X is the child of T and Z, who is the grandmother of H. K is the mother of M, who is the only sister of H. X is unmarried. If S is the spouse of A, how is K related to S?