Though it was the boy's father who made a request of Jesus, Jesus responds to the whole crowd. This can be made clear. Alternate translation: "Jesus responded to the crowd" (See: [[rc://en/ta/man/translate/figs-explicit]])
Jesus uses these questions to express his frustration. Both questions have the same meaning. They can be written as statements. Alternate translation: "Your unbelief tires me! I wonder how long I must bear with you." (See: [[rc://en/ta/man/translate/figs-rquestion]] and [[rc://en/ta/man/translate/figs-parallelism]])