Anonymous wrote:Not exactly the same, but try What Alice Forgot, by Liane Moriarty
I read it back when it came out, early in my marriage. Loved it on multiple levels - first as an interesting, easy-to-read novel, and also as a thoughtful take on how we view and show up in our own life and the other choices we might make instead. (Road-not-taken, albeit in a different way.)
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Anonymous wrote:This Time Tomorrow, Emma Straub. This is a "time travel" book, but back to the protagonist's own life: Alice, almost 40, finds a way back and forth to her earlier self at 16 years, and has a chance to reassess her decisions. But the center of the story is her dying, much loved father, who she gets to experience again in his earlier stages of life. Thought it was a really great book - though the focus may be a little different than your request.