Jonathan was only trying to persuade Alexander to accept Jeanne. His goal was to use Jeanne to develop Lawrence Enterprise to greater heights.
However, to Alexander, it sounded like Jonathan wanted Jeanne to manage the entire Lawrence Enterprise.
Once Jeanne was a little more capable, Jonathan might hand Lawrence Enterprise over to Jeanne.
Even if Alexander did not want to admit it, he had to say Jeanne was much more capable than he and Joshua combined.
Moreover, he knew very well how much his father valued Lawrence Enterprise, the family business that had been passed down for generations.