In the movie, his father has cancer, and his death will happen sooner or later. And if the male protagonist gives birth to the third child, he cannot travel back to before the sperm formation, because if he travels back, history will be changed, so that the third child will change, such as becoming a boy and so on. Just like when Tim returned to his sister's car accident, Tim hoped that his sister could be reborn, told her the truth about the journey, and returned to the time before giving birth to his first child, Percy, and found himself when he returned to reality. The child has become a little boy, so Tim decides to give up saving his sister for his child Percy. I'm so touched after watching it, I especially like this movie ❤
I was moved by the last inner paragraph at the end
"And in the end, I think I've learned the final lesson from my travels in time. And I've even gone one step further than my father did. The truth is I never travel back at all, not even for the day . I just try to live everyday, as if I've deliberately come back to this one day, to enjoy it, as if it was the full final day of my extraordinary, ordinary life. We are all travelling through time together, everyday of our lives. All we can do is do our best to relish this remarkable ride."
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