Mrs. Wals did not doubt Jimmy's identity because he didn't resemble Veronica. She understood her student Tom's character well, and his relationship with Veronica was definitely not just because she saved Tom.
It's just that now Veronica is dead, and Tom has truly become a loner. Having a junior like this to worry about is a good thing; it's hard for someone with nothing to be happy and content.
Mrs. Wals inquired about Jimmy's recent years, and Jimmy didn't hide anything. In recent years, he has worked as a police officer and an FBI agent, and most of the work he did was talkable, except for some shady operations he didn't mention.
Soon, a young man outside came to knock on the door, "Grandmother, Thomas Nolan is here."
Mrs. Wals: "Let him in."
Jimmy stood up and moved behind Mrs. Wals. Three people came in from outside, and the young man opened the door and invited in two people.