How to ask a relative clause to describe an object that is marked with に。


OK so I understand that to say "He is lying to me", you would say:

> 彼は私に嘘をついている。

My question is how would i say "The person he is lying to is me."

or from "I gave the book to my brother"

> 兄さんに本をあげた。

"the person who i gave the book to is my older brother"

