4. In a family of three generations, there are eight members, Mohan and Nirmal are brothers, Rahul is the grandson of Qasim. Trimurti is the only niece of Mohan, Prabhjot is the sister-in-law of Nirmal. Mrinal is the mother-in-law of Sohana. There are three married couples in the family. Trimurti is the daughter of Sohana.
How is Rahul related to Trimurti?