I am a convert to Catholicism from evangelical Protestantism, same as Chuck Swindoll.
He is a dear pastor who has never, in all the years that he has been preaching, been involved with any scandal or caught in any heinous sin. He loves the Lord Jesus, and it is obvious in his cheerful demeanor and engaging preaching style.
My suggestion is that you read the book so that you will better understand and appreciate your parents and their faith.
The Catechism makes it clear that as much as possible, we Catholics need to keep communication lines open between us and Protestants. Understanding their theology and lifestyle will help you to better communicate with them, and this means that you will be able to obey the teachings of the Catholic Church and maintain constructive dialogue.
Your parents will be more willing to listen to you talk about the Catholic teachings if you demonstrate that you are willing to listen to them talk about their Protestant teachings (or in this case, read Pastor Swindoll’s book about Protestant teachings).
If this is the worst thing your parents ask you to do–read a book–then you are indeed fortunate. For the sake of all the time, energy, money, and love that they put into raising you, do this for them. Offer this as a gift to them, and read the book that they gave you. Learn from it. And be ready to tell them about YOUR faith, using their Bible.