Jacques-Joseph influenced his brother, Jean-Francois Champollion by encouraging his interest in Middle Eastern languages. This is the right option, as he never had a personal interest on Middle Eastern languages as his brother did, so he never started nor copied it. What he wanted was to support him in any way possible, since he was young and later on, when he even had to support him financially. The option about mocking his brother's interest makes no sense because he always encouraged him.