Question: What is the name of the character who has a son named Louis and has been played by the same actor since the series' inception?
Sentence (from "Exile (Casualty)"): The plot sees Charlie Fairhead (Derek Thompson) and Connie Beauchamp (Amanda Mealing) travel to Bucharest to help Charlie's son Louis (Gregory Foreman), who has become a heroin addict and is planning on selling his kidney to pay his debts.
Relevant evidence: Yes