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I just finished reading Susan Cooper's The Dark Is Rising sequence which does almost exactly this, although over five books. The first book has three siblings as main characters, book 2 has one boy...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/21708 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/21708 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I just finished reading Susan Cooper's _The Dark Is Rising_ sequence which does almost exactly this, although over five books. The first book has three siblings as main characters, book 2 has one boy (with many siblings), book 3 has the boy and a second boy both as main characters, and books 4 and 5 use all the kids. I was fine with the idea of the story going back and forth; my only caveat is that it should be the same _kind_ of story. The three siblings were "mortals getting involved with magic" and the two single boys were "magical folks dealing with magical things," and those are not the same kind of tale. That created more whiplash for me than changing protagonists or POVs. Anne McCaffrey did it better in her Harper Hall trilogy; books 1 and 2 are about Menolly and book 3 is about Piemur. Each is a minor character in the other's story, and the overall storyline is chronological. It works fine.