Priya is Ravi's sister, and they both have a cousin named Arjun. Arjun's mother, Sunita, is the sibling of Priya and Ravi's father. Priya and Ravi have an aunt named Lakshmi, who has a son named Vikram and a daughter named Diya. How are Vikram and Diya related to Priya, Ravi, and Arjun? Respond very briefly.
Vikram and Diya are the children of Lakshmi, who is the aunt of Priya and Ravi. This makes Vikram and Diya Priya and Ravi's cousins. Since Arjun is also a cousin of Priya and Ravi, and there is no information provided that Arjun has any siblings, Vikram and Diya are Arjun's cousins from the other side of the family. Specifically, since Sunita is Arjun's mother and sibling of Priya and Ravi's father, and Lakshmi is the aunt (implicitly the sister of either Priya and Ravi's father or mother), Vikram and Diya would be cousins to Arjun through his other parent's side (either his father or mother, depending on which sibling Lakshmi is).