Jacob narrowed his eyes at Nora and said, "You should have told us. We could have checked his background and made careful watch on him,"
Jacob and J trusted Timothy enough to let him do the investigation about who the prime minister hired to find Nora's identity.
When Timothy reported to them about a certain Lucas Upston, they were already suspicious about it but they still let Timothy handle it even if Nic insisted on making his own investigation.
They knew when Timothy slipped up and let a man named Damien Roald enter Nora's apartment without them knowing. It was Nic's cue to not listen to his parents and made his own investigation about the man.
That is how Nic found out who Damien Roald was just in time that Timothy also found out about Damien Roald being Lucas Upston.
But they all did not expect Damien Roald to be the illegitimate son of the prime minister. And it turns out, he was also Nora's ex-boyfriend from seven years ago.