Elias, gesturing to himself: Elias Bouchard.
Elias, gesturing to Simon: Simon Fairchild.
Elias, gesturing to Peter: Peter Lukas, the whiny baby of the group.
Peter, whining: I am not!
Peter is considered a pretty unusual example of a Lukas because of how friendly and chatty he can be, and he clearly didn’t learn that from his family… so what if he learned that from Simon? What if he met Simon as a kid and basically started emulating the way Simon speaks to people? Simon is really good at the whole ‘disarmingly friendly despite being a horror monster’ thing, and Peter had to learn that somewhere.