Mister!
It was the only appellation Darla used to address the three founders of the Dragon-slaying Club.
Because in her eyes, the three of them were together!
Behind Bill Bernoulli was the Bernoulli family, one of the four major families in Washington, who had many talents under their command in America.
Standing behind Jacob was a military organization of the Dragon Arrow. Although it was not as large as the Dragon Arrow, it was still a formidable force in the capital, and most of his family members were also the core members of this force.
As for Henry...
In terms of background and means, he was not as good as the first two. However, his father was one of the three giants in Los Angeles. His father held great power and was less than 45 years old. At this age, with this kind of achievement, his father was very likely to become a functionary and have a bright future.