According to what Roger knew his father died during World War II. But after traveling back to 1739, Roger finds his father and sends him back to the future. Roger seems to have a memory of his father being with him in the tube station and later of saving him from the stations collapse.
Roger’s original story of the tube station collapse was that his mother threw him to someone to save him. It isn’t until Roger experiences a near miss with a cannon that he realizes the person who caught him was his father.
Did Roger change who caught him by sending his father home? According to Roger, after he remembers his father’s presence in the tube station, they were always part of history.
Roger believes in all their attempts to change things or the times they were they and has some influence… it was always true. As in because they are time travelers they has already been part of the event without even knowing it.
These goes to show when Jamie and Claire were trying to stop Culloden and couldn’t do it; it was more about the massive amount of moving parts going into a war than their ability to influence anything. And why they’ve only ever been able to influence small things.
