So the father was looking for guidance, and the pastor was looking for that sweet reward money? Somehow less wholesome.
That one is kind of a wobbler. The pastor is a mandatory reporter, and as such, MIGHT not be eligible for the reward. For instance, a teacher is a mandatory reporter for child abuse, so they don't get any money for reporting it. BUT, that same teacher WOULD be eligible for the reward for turning someone in for tax fraud, because it's not related to the scope of their duties as a mandatory reporter.
The pastor is not a government employee, which makes it more likely that he's eligible for the reward. BUT, pastoral counseling, which is what he was doing when he advised the father and son to turn in the shooter, is very much within the scope of his duty as a mandatory reporter. In the end, the boy surrendered, so technically he turned himself in, in which case, nobody gets the money.
Either way, I expect that the FBI will find a way to avoid paying the 100k to the minister. Whether he gets the $50,000 that a private individual offered, or the million that a different private individual offered, is up to those who offered it, since the government doesn't control those funds. Still, if the FBI says "Sorry, no money for you," to the pastor, it's likely that both of these people who offered additional rewards will also refuse to pay him.