I think for the most part, Jem and Scout think very highly of their father. However, in Chapter 10, they learn a few new things about Atticus which cause them to give him greater respect. At the beginning of the chapter, they complain about Atticus being "feeble: he was nearly fifty." Older than most of their classmates' parents, Atticus had a boring job, didn't play sports and wore glasses. However, when Sheriff Tate suddenly handed over his rifle to cut down the rabid dog, the children's whole outlook changed. "One-Shot" Finch had been the greatest marksman in the county, yet he had never told them about it. They learned not only about his sure-shot status but also about the definition of humility. Additionally, they learned that he deliberately lost when playing checkers with them. They came to understand that he had some very special traits after all.