Amitabh is Pranav's uncle on his father's side. Amitabh has a sister named Priya who is married to Anand, and they have a daughter named Rani. Pranav has a sister named Diya. How is Diya related to Priya, and what is Rani's relationship to Pranav? Make your response very short.
Diya is Pranav's sister, and since Pranav is Amitabh's nephew on his father's side, Amitabh is Diya's uncle as well. Priya is Amitabh's sister, hence Priya is also Pranav's aunt on his father's side and Diya's aunt for the same reason.

Rani is the daughter of Priya, making Rani Amitabh's niece. Since Priya is Pranav's aunt, her daughter Rani is Pranav's cousin. Therefore, Rani is also Diya's cousin as Diya and Pranav are siblings.