pointing to gopi, nalni says, i am the daughter of the only son of his grandfather. how nalni is related to gopi?

Nalni is related to Gopi as his sister.

Here’s the quick breakdown of the logic:

• “His grandfather” = Gopi’s grandfather.

• “The only son of his grandfather” = Gopi’s father (because the grandfather has just one son).

• Nalni says “I am the daughter of the only son of his grandfather” → Nalni is the daughter of Gopi’s father.

• Children of the same father are siblings, so Nalni is Gopi’s sister.

So the answer to “pointing to Gopi, Nalni says, I am the daughter of the only son of his grandfather. how nalni is related to gopi?” is: sister.