How would Ethan have felt if his grandmother had told Nadia about his brother?

Idk

I assume this is homework. But since I don't know Ethan and never met his granmother, Nadia, or his brother, I could not tell you.

I bet he's really rather annoyed ;)

Who Ethan? Or the Brother?

Probably the writer as we haven't answered his assigment for him :p

Are you talking about the book, "A View From Saturday?"