How do you know that Jem respects his father?On what page of the book can I find it?
The first instance that came to my mind when I read your question was when Heck Tate had Atticus shoot Tim Johnson, the dog with rabies. Jem and Scout had just gotten through quizzing Calpurnia and Miss Maudie as to what exactly their father could do...and feeling rather ashamed that the only thing they could come up with is that he was a good checker-player and could play the Jew's Harp. Then they found the dog, wandering down the street, clearly sick. Once Mr. Tate and Atticus got to the Finch house (after Calpurnia called Atticus and told him about the dog), Tate insisted that Atticus shoot the dog, fearing that if he missed he would hit someone's house. Atticus did it, and the children heard Miss Maudie call him One-Shot Finch.
Jem and Scout learned that their father was the best shot in Maycomb, and Jem especially learned that they never knew about this because Atticus didn't feel it right to brag about a talent that God had given him. Jem ends that chapter saying, "I wouldn't care if he couldn't do a blessed thing...Atticus is a gentleman, just like me!"
This incident occurs in Chapter 10, but I know if you do a close reading of the book, you will find many more instances of Jem realizing what a treasure his father is. Good luck!