I have just re-watched The Leap Home part 2 and I have a giant case of the goose bumps. I do however, have a question about Sam's ability to change history. In this episode Sam saves his brother , Tom, from being killed. Even though Sam was not sent back for this purpose in his original leap he changes history. Does Tom die? If he doesn't die, how does this alter history for Sam? Is there any other mention of Tom in future episodes?